All transmissions, once assembled, have to be installed in a car. 3. Attach air lines and your race ready. First, the top loader has three levers on the drivers side of the case, 1 is for 1st and 2nd gear, the next is for reverse, and the third is for 3rd and 4th gear. Lenco transmissions were first made popular in the early '70s when NHRA Pro Stockers needed a gearbox that was up to the task of 9-second elapsed times. This information leads to a selection of sun gears with associating ratios, ring gears, and properly sized planet gears that mate the sun gears to their ring gears. In the example of a four speed, the case nearest the engine would Second gear ratio is 1.80 and third gear is a 1.31 ratio. Screw air servo into case until it bottoms out against the jam nut. (1) in the bruno/lenco the fluids are seperate - which gives you options of running different fluid types and no chance of breaking the lenco side and mixing it into the converter. 1.29, 1.35, and 1.41 gear ratios have been added making a larger list of eight selectable gear ratios. Smaller diameter and shorter length make this transmission a practical choice for use in restricted confines and instances when you have limited distance from the engine to the rear end. Small Sprag Assembly -This is a our small Sprag, note the snap ring in the outer race and single brass thrust washer. I use an electric over air setup to shift my new B and J transmission. 1.566% Uses 18 tooth planet gears, a 45 tooth sun gear and an 81 tooth ring gear. 1 position forward selects 1st gear, then 2nd gear is selected by . The tallest to the right is used to shift the transmission from first to second gear. When the transmission is shifted a clutch pack compresses the rotating sun gear assembly to the direct drive central sun gear. There are two different size air servos for the New Generation transmissions.The small air servo (2.5"piston diameter) and the large air servo(3"piston diameter) for the CS-2 large case transmission and Lencodrives. As with all Lenco transmissions the ST1200 is a planetary design and comes with up to 6 forward speeds. 8620 is a premium quality material that will provide excellent service for 1200 HP hot rods. Shafts are available in Marage or 300M material.16 or 32 spline. Each LENCO transmission is thus a two-speed and is housed in its single dedicated case. With a selection of 16 first-gear ratios for the two-speed and hundreds more for three-speeds the LENCODRIVE presents you with the opportunity to dial-in your exact combination. Lencodrive 2 Speed. The gearset in the third case alone, 1.31:1, determines the third gear ratio. Now rotate counter clockwise 1/2 to 1 turn and tighten lock nut. 1.23%Uses 21/30 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. The middle case would also contain a 1.37 planet gear set. Copyright 2020, Lenco Racing. Screw air servo into case until it bottoms out against the jam nut. This is not possible with a traditional cluster gear transmission. 1.16% Uses 21/36 tooth planet gears, a 22 tooth sun gear and a 79 tooth ring gear. The Lencodrive will accept virtually any manufacturer's torque converter. 1.38% ratio uses 23 tooth planet gears, a 28 tooth sun gear and a 74 ytooth ring gear. 1.31% ratio uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. First you need to determine which style clutch packs you are working onsee chart. Lenco, the all time champion and undisputed leader in the drag racing transmissions. 1.48% Uses 22 tooth planet gears, a 40 tooth sun gear and a 83 tooth ring gear. up to the CO2 configuration or vice versa. Three planetary gears rotate around the sun gear like planets traveling in their orbit. 1.21%Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear. These four gears (sun gear and three planet gears) sit in a planetary carrier that holds them together as a unit. The rear case a 1.31 ratio gearset. All Lencodrives come with the following (less converter). The LENCO ST1200 is the answer for Pro Street and street/strip applications. When you add the fact that this car is a manual, it really makes this drag racing video a rare one to enjoy. I believe the main difference between running ATF and 30wt engine oil is the speed in which the Lenco clutches can close up at the shift. 1.73%Uses 14 tooth planet gears, a 76 tooth sun gear and 104 tooth ring gear. The Lenco provided unbreakable performance and lightening-quick gear changes, which made these clutchless wonders the tranny of choice among the ultimate door slammer crowd. It is bolted to the end of the transmission with a splined output shaft which will await the driveshaft yoke. Gear ratios are selected using a mathematical calculation that considers both the number of speeds required, horsepower of the car, and final rearend drive ratio. On the track, however, the low 48 percent first gear should be enough to launch any powerful car hard, and the transmission's history of performance won't let anyone down. This clearance should be between .080"-.120" and can be adjusted by adding or subtracting floaters . 1.56% Uses 22 tooth planet gears, a 55 tooth sun gear and a 98 tooth ring gear. It is not necessary for the driver to disengage the clutch when shifting from ratio to ratio since all shifting is done with the engines clutch fully engaged. Race prepped Hydramatic. street transmission, The LENCO Gear Reducer is used as a stand-alone unit or in conjunction with our CS1 Standard Design and CS2, CS3 and CS4 New Generation transmissions in order to employ tall rear gears with the advantage of a short launch ratio. It makes a powerful and unique street transmission that offers Hot Rodders a gearbox that can handle up to 1200 horsepower reliably, while offering versatility to seamlessly change between an easy drive on the streets to racing hard on the weekend. When this same section is shifted the Sprag then allows the sun gear to rotate in the same direction as the crankshaft. This gadget employed three shift levers to accomplish everything that a single lever could do. In order to achieve an underdrive first gear ratio the LENCO transmission relys on planet gears which rotate around the previously mentioned sun gear. 1.19% (1.191) - Uses 28/38 tooth planet gears, a 23 tooth sun gear and a 91 tooth ring gear. Please call for ordering or technical information. 1.297%Uses 26 tooth planet gears, a 22 tooth sun gear and a 74 tooth ring gear. 1.256% Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear. Choice of standard or new generation reverses. Lenco offers an extensive variety of transmissions. Magnesium Tailhousing (Bushing or Roller Bearing) 300M 32-Spline Output Shaft. 1.31%Uses 27 tooth planet gears, a 25 tooth sun gear and a 80 tooth ring gear. If a sun gear to ring gear has a ratio of 1.44, then the intermediate shaft that is attached to the planetary carrier is spinning at a 1.44 reduction in relation to the input shaft. Run air servo jam nut and o-ring down against the case and tighten with a 1 1/2" wrench. Then, continue to screw air servo Out (counter-clockwise) one half turn. Shown with our boat bellhousing. They only serve to transfer the power of the ring gear to the planetary and to rotate around the sun gear if the sun gear is held stationary by the sprag clutch. Equipped with a Lenco ST1200 5-speed transmission, Jeff regularly drives his car on the streets around his home in Oceanside, CA. Air or lever shift. 4,600. The gearset in the third case alone, 1.31:1, determines the third gear ratio. All levers in forward position result in the transmission being in first gear. Since each case contains one gearset and provides both underdrive and direct drive,multiple cases (gearsets) provide multiple underdrive ratios. For additional information about Lenco products please email us here, or call us at (909) 673-9080. A five speed requires four cases, and a six speed requires five cases. 1.48%Uses 22 tooth planet gears, a 40 tooth sun gear and a 83 tooth ring gear. A perfect replacement for expensive breakage prone Powerglides, Turbos, C4, C6 style and Torqueflite transmissions the Lencodriveis 100% Lenco. <lol> Trust me, It's no where near shoulder height ! Traditional manual transmissions consist of at least two linear shafts: an inline input and output shaft, and a counter shaft. The 2 speed, including reverse, bellhousing and lining weighs approximately 108 lbs. 1.22%Uses 38 tooth planet gears, a 22 tooth sun gear and a 98 tooth ring gear. We do offer different thickness floaters for correcting the clutch pack clearance. The middle case would also contain a 1.37 planet gear set. Refining the machining process of how the gears are made and even designed resulted in more efficient gears that mesh together easier than the previous version. Once engaged, the gears are shifted without a clutch. 1.44% Uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear. This is our large sprag and unlike the small sprag doesn't have a snap ring in the outer race and has two brass thrust washers. Sight through plug hole, where you will see the outer edge of the rotary shift plate. Checking Shift Pressure(only on CS-1 style or center shift transmissions): To measure the shift pressure install checking lever into tower screw jam nut all the way up the tower so it's out of the way. His typical drives usually include lighting up the rear tires while going sideways as he yanks the levers back, shifting the ensemble of levers to move the transmission through 1st, 2nd, and 3rd in quick succession. In order to achieve an underdrive first gear launch ratio the LENCO transmission relys on planet gears which rotate around the sun gear. The CS2 ,CS3, and CS4 5 likes, 0 comments - Dale's Transmission (@dalesa1transmission) on Instagram: "Weird Transmission Wednesday The Lenco Lenco is not the only manufacturer of these types ." Dale's Transmission on Instagram: "Weird Transmission Wednesday The Lenco Lenco is not the only manufacturer of these types of transmissions, but it is . Most often seen in supercharged alcohol and mega HP nitrous cars the CS1 Standard Design LENCO is also commonly used by Pro Mod machines and blown nitro and alcohol drag boats. Screw air servo counter-clockwise about five or six turns before you reassemble the transmission. Aside from manufacturing benefits, it also gives customers a finished piece that looks more like jewelry than an automotive part. 1.25% (1.252) - Uses 24/28 tooth planet gears, a 23 tooth sun gear and a 78 tooth ring gear. I've mounted it where It's most comfortable for me. Shifters and lockouts can be either style. The lever arms also vary in length. 1.28%Uses 32 tooth planet gears, a 25 tooth sun gear and a 89 tooth ring gear. It is also 2-lbs lighter for lower rotational mass which translates to quicker acceleration. Throwout bearing collar (4 & 5-speed only). The Lencodrive is pure Lenco through-and-through with the same gearset components as our CS2. 1.68% Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear. By multiplying these three ratios you come up with a 2.46 first gear ratio. 1.479% Uses 19 tooth planet gears, a 35 tooth sun gear and an 73 tooth ring gear. 3 speed. Once you have achieved the proper clearance reinstall the pressure plate spring and clutch housing snap ring it is then complete, ready for installation. I shift it with a timed switch getting its signal from an electric shifter box so that it applies voltage for 17 sec at the shift. The CS1 will control up to 3000 HP. Here's some fuzzy footage showing the operation. All levers in forward position result in the transmission being in first gear. 1.313%Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. A typical lever shift assembly Consists of hand levers, activation rods, detent levers, rod towers, adjustment nuts, clevises, heim ends, friction washers, mounting bracket and all When you shift into second gear a lockout happens which "locks" the sun gear, three planet gears, and the ring gear together so that they all spin in unison. 1.338% Uses 24 tooth planet gears, a 25 tooth sun gear and a 74 tooth ring gear. Lenco celebrates over forty-five years of the engineering and manufacturing of the most successful drag racing transmissions ever built. Light weight ring gears (units w/27 and 32 spline shafts only). 1.313% Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. Each sun and planet gearset represents two speeds. INSTALLATION Watch it while someone pushes the shifter button. In the Lenco, the shift lever actually moves the clutch pack together to engage the gear in each housing. This is a very extreme duty sprag assembly. This change cut down weight substantially which added to the overall rotational mass reduction. Please click here for CS3 Timing Chart (.pdf). Then start the tires spinning, now shift the front section so that you are now in high gear. The ST1200 transmission is pure Lenco through and through and is ideally suited for nitrous, blown, injected and carbureted engines producing up to 1200 HP and 900 lb ft of torque. The gearset in the third case alone, 1.31:1, determines the third gear ratio. 1.56% - Uses 16 tooth planet gears, a 41 tooth sun gear and a 73 tooth ring gear. Final drive ratio is 1:1. Typically the CS-1 and CS-3 run the 2.50" piston air servo (150 psi) and the CS-2 and Lenco drive runs the 3.00" piston (250 psi). There are a lot of variables. 1.35% Uses 26 tooth planet gears, a 28 tooth sun gear and a 80 tooth ring gear. Again, in an effort to increase fuel economy, Vipers ship with tall 3.07:1 final drive ratios. gearset/ratio and when connected to additional cases multiple ratios are realized. 1.24% Uses 26/31 tooth planet gears, a 23 tooth sun gear and an 80 tooth ring gear. 1.25% ratio uses 32 tooth planet gears, a 22 tooth sun gear and an 86 thooth ring gear. Screw air servo counter-clockwise about five or six turns before you reassemble the transmission. The second lever, and second tallest, is used for third gear. - Uses 22/38 tooth planet gears, a 24 tooth sun gear and an 84 tooth ring gear. You always need to come out of the water box in high gear to prolong the life of the transmission. necessary hardware. at a lesser price than our full race units. This is how we engage gears in a traditional manual transmission. No further adjustments are necessary as there is ample reserve travel in the servo. 1.48%- Uses 22 tooth planet gears, a 40 tooth sun gear and an 83 tooth ring gear. Gears that mesh easier suffer from less resistance, which leads to higher efficiency and less parasitic loss. 2 Speed with single brg and std output: 16.875". Lencodrive 4 Speed. Upshifting is very commonly done this way, but you can also do it while downshifting. You must multiply each case's underdrive ratio in order to determine the first gear ratio. 2 Speed + reverser with Pro output: 18.500". - Uses 28/38 tooth planet gears, a 23 tooth sun gear and a 91 tooth ring gear. Lenco Racing Transmissions have brought more of their racing technology to the street crowd with a new transmission that is lighter, engineered with new technology, has more efficient components, and has less rotating mass than the previous unit. We got to ride along in an ST1200 equipped car, and what a monster of a car it was. 3 Speed + reverser with Std output: 24.000". 3/4" Gear Set. The shift lever is almost the same height as the standard 5th gear lever. The biggest benefit to Pro Streeters is that you don't have to worry about overheating, flashing the torque converter or other maintenance costs-as there are none. Large Sprag Assembly -This is our large sprag and unlike the small sprag doesn't have a snap ring in the outer race and has two brass thrust washers. The dual clutch manual transmission is simply fast. Lenco, the all time champion and undisputed leader in the drag racing transmissions. It's capacity is much stronger than the small sprag. Each lever controls one planetary gear set. All Rights Reserved. Final drive ratio is 1:1. Apply a small amount of Red (271) Locktite on the set screw. 1.41% Uses 23 tooth planet gears, a 32 tooth sun gear and a 79 tooth ring gear. 1.368%Uses 21 tooth planet gears, a 25 tooth sun gear and an 74 tooth ring gear. You must multiply each case's underdrive ratio in order to determine the first gear ratio. These new gear offerings allow Lenco to meet any customer's needs, and allows customers to fine tune their transmission and rear end setup to their hearts desire. In all instances the transmission is then shifted to a 1:1 direct drive ratio by depression The 4-speed above shows how to determine drive ratios. Th.. Since each case contains one gearset and provides both underdrive and direct drive, multiple cases provide multiple underdrive ratios. 1.25% - Uses 34 tooth planet gears, a 23 tooth sun gear and a 91 tooth ring gear. A G-force or Liberty face plated 4 speed may be what you want. the shift pressure to maintain desired wheel speed and traction. 1.23%Uses 21/30 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. Once installed, make sure the air servo is loose and can turn freely. Stay up to date with news and promotions by signing up for our monthlly newsletter. Since internal combustion engines have a short torque band, we utilize transmissions to change the speed that the wheels spin by either using larger or shorter gear ratios. To install lever remove bolt, insert lever in shift tower so that it faces forward and install bolt. We found the small Sprags service life growing shorter and shorter, so we have discontinued it and highly recommend upgrading to our large Sprag assembly. Lenco, the all time champion and undisputed leader in the drag racing transmissions. Section upon section are bolted together until the transmission takes shape, growing taller than the technician building it. Easy to use and necessary for fine tuning 1.25% Uses compound 25 and 29 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. All Rights Reserved. the shift pressure to maintain desired wheel speed and traction. It's capacity is much stronger than the small sprag. The ring gear is then pressed inside of the bearing. 4 speed. 1.35% Uses 26 tooth planet gears, a 28 tooth sun gear and a 80 tooth ring gear. The ST1200 is available with all popularbellhousing patterns - Ford, GM, MoPar and our own five-bolt design. We happen to run synthetic AFT. Each LENCO transmission is thus a two speed and is housed in one dedicated two speed case. CS1 Standard Design ln general, all Lenco transmissions are a planetary design. Unfortunately, we no longer sale small Sprags do to the ever increasing horse power produced with today's motors. We recommend that you discuss your application with our technical representatives and follow their suggestions on which View the whole process and start at the beginning. The position of the shift lever is relative to the application. After inserting arm into the air servo piston boss, run set screw in until you can no longer remove the arm from the piston boss. In all instances you will require a LENCO reverse unit to achieve reverse movement. 1.56% Uses 22 tooth planet gears, a 55 tooth sun gear and a 98 tooth ring gear. 1.20% Uses compound 22 and 32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. The Lenco Racing Lencodrive 2 Speed Automatic Transmission represents our response to people who hav.. Second gear ratio is 1.80 and third gear is a 1 .31 ratio. 1.338%Uses 24 tooth planet gears, a 25 tooth sun gear and a 74 tooth ring gear. Remember that each separate case contains it own This is what comes standard in most new LENCO transmissions. The arm is held into the servo piston by a set screw. Leaving the pressure plate spring (wave spring) out, place the pressure plate on top of the clutch pack. 1.48% ratio uses 22 tooth planet gears, a 40 tooth sun gear and an 83 tooth ring gear. In order to achieve an underdrive first gear launch ratio the LENCO transmission relies on planet gears which rotate around the sun gear. Lenco, the all time champion and undisputed leader in the drag racing transmissions. The first gear set is multiplied by the next, which is multiplied by any subsequent gears sets to eventually reach the final drive ratio of 1:1 where the output shaft is spinning as fast as the input shaft (or overdrive which is any ratio lower than 1 like .85:1). Chevy Pilot Bearing Assembly 1955-2000 Chevrolet (SB & BB), and Lenco transmissions. RATIO CHART 1.48% Uses 22 tooth planet gears, a 40 tooth sun gear and a 83 tooth ring gear. 1.405% Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 tooth ring gear. Although the initial cost is more than a well-built TH400, the longer durability and low-maintenance cost of the Lenco will pay for itself in the long run. 5-Speed $10,660. Each case in succession, with its particular underdrive ratio, determines the immediate drive ratio. This L.. Lenco Clutch Disk Alignment Tools areavailable in black anodized billetaluminum. 1.25% ratio uses 32 tooth planet gears, a 22 tooth sun gear and an 86 thooth ring gear. shift pressure control. Both ATF and engine oil supply the required amount of lubrication and cooling for a Lenco transmission. Originally the ST1200 was only offered with a selection of five gear ratios (1.25, 1.31, 1.38, 1.44, and 1.48). Screw air servo into case until it bottoms out against the jam nut. 1.20%Uses 22/32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. On the street five-speed model the ratios start at 3.25 in first gear, 2.26 in second, 1.64 in third, 1.25 in fourth, and fifth gear is 1:1. A typical CO2 shifting assembly Consists of either a small or large CO2 bottle, bottle brackets, pressure gauges, pressure adjustable shift buttons, air servo, pressure line, fittings and 1.50% - Uses 17 tooth planet gears, a 34 tooth sun gear and a 68 tooth ring gear. Exclusively V.A.R. All Rights Reserved. Those two speeds are (1) the lower underdrive ratio and (2) the direct'1:1 final lock-up drive ratio. Both transmissions are available in 2,3, 4 or 5 speeds. automatic, Lenco transmissions essentially combine the best of a manual and automatic transmission into one unit. Screw the servo into the transmission case until contact is made with the shift fork pin. Our most common style clutch disc is the green disc and it comes in two sizes depending on which style transmission you are working on. 1.17% (1.165) - Uses 22/38 tooth planet gears, a 24 tooth sun gear and an 84 tooth ring gear. Attach air lines and your race ready. Magnesium cases are used for both the CS2, CS3 and CS4. Run the air servo jam nut and o-ring up the threads on the servo. Think of it as manually shifting an automatic transmission. Engineered to handle 3500+ HP the Standard Design LENCO is available with up to 5 speeds and comes in a cast magnesium case. All transmissions are the sum of their parts. multi lever system or with the optional, more compact CO2 setup. Chevy Pilot Bearing Assembly 1955-2000 Chevrolet (SB & BB), and Lenco transmissions. The Lenco Racing Lencodrive is the automatic answer for people who prefer torque converter/automatic transmission applications. There are a variety of both manual and CO2 servo tower designs. Now rotate counter clockwise 1/2 to 1 turn and tighten lock nut. This is an in-car shot video of Mike drag racing his 73 Duster using a clutch-less Lenco Transmission. Th.. 1.44% ratio uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear. 1.19%Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. All Rights Reserved. The Lenco is basically a planetary transmission where each gear has its own housing and its own shift lever. What does this mean, you wonder? and control slippage. Its used to force the gear set to make it's ratio by preventing the sun gear from rotating in one direction. 1.280% Uses 27 tooth planet gears, a 21 tooth sun gear and a 75 tooth ring gear. Each gear is engaged by pulling down on the shift lever, to activate the clutch mechanism for each gear set. 1.44%Uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear. Final drive ratio is 1:1. CS-1 style or center shift transmissions: Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. 1.38%Uses 23 tooth planet gears, a 28 tooth sun gear and a 74 tooth ring gear. You must multiply each cases underdrive ratio in order to determine the first gear ratio. This means that it can run for years without any maintenance and still operate smoothly. The CS1 planetary gear size is 1". Lenco, the all time champion and undisputed leader in the drag racing transmissions. The second lever, and second tallest, is used for third gear. The ST1200 gives you the advantage of Lenco brute strengthat a lesser price than our full race units. Air shifted LENCOS come pre adjusted from the factory. Rotate air servo into case until you see the set screw in the air servo piston boss inside the case. With its larger size and more teeth, it rotates faster, so it spins the output shaft faster, which in turn spins the rear wheels faster. All LENCO transmissions can be shifted with levers or a CO2 system. Take the Hurst Lightning Rods, an aftermarket performance shifter marketed in the 1980s. It also allowed Lenco to shave as much weight as possible from the finished part. Now taking all the lash out by lifting up on the clutch housing (outer housing) and press down on the pressure plate then measure the distance between the top of the pressure and the bottom of the snap ring groove of the clutch housing, This is your clutch pack clearance. custom vertical gate shifter, push button downshifting. Recommended for cars making up to 1200 HP the ST1200 is pure LENCO through and through. Gear Ratio Reducer The next lever is used for fourth gear and final lever for fifth. There are two different size air servos for the New Generation transmissions.The small air servo (2.5"piston diameter) and the large air servo(3"piston diameter) for the CS-2 large case transmission and Lencodrives. lencodrive, Lencodrives is a CS-2 transmission. 1.566%Uses 18 tooth planet gears, a 45 tooth sun gear and an 81 tooth ring gear. The Lenco assembly drawing shows two .030" shims on the front side of the plate and one .180" shim on the side where the pressure plate is. The planet gears are driven by an encompassing ring gear. We supply premium grade bearings in the ST1200 instead of the much more expensive aerospace-spec bearings as used in our race transmissions. So, a transmission may have a first gear ratio of 2.47, a second gear ratio of 1.80, a third of 1.31, as the transmission works its way down to its final drive ratio of 1:1 where the output shaft that drives the wheels is spinning as fast as the input shaft which is attached to the motor.

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