how to shift a lenco transmission

These are the 5 weirdest transmissions ever sold | Driving The Sprag clutch is utilized in each shiftable section of the LENCO with the exception of the reverse. bellhousing patterns - Ford, GM, MoPar and our own five-bolt design. 1.22%Uses 21/30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear. Final drive ratio is 1:1. 4,600. Lenco has gone through a lot of changes in the past year, with a new owner and new location, the team at Lenco set out to redesign, revamp, and redefine the ST1200 street transmission as the new leader in street planetary transmissions. This is how we engage gears in a traditional manual transmission. His dial-in time is 10.60 and his ET for this race was a 10.61. The boat clutch provides gentle engagement and disengagement. This is not possible with a traditional cluster gear transmission. By multiplying these three ratios you come up with a 2.46 first gear ratio. Operation of a Lenco is fairly straight-forward: When it's time to shift gears, simply pull the appropriate lever, with each gear having its own stick. Screw the servo into the transmission case until contact is made with the shift fork pin. LENCO transmissions are shipped with the shift levers removed in order to prevent damage during shipping. In order to achieve an underdrive first gear launch ratio the LENCO transmission relys on planet gears which rotate around the sun gear. We recommend that you discuss your application with our technical representatives and follow their suggestions on which 1.50% - Uses 17 tooth planet gears, a 34 tooth sun gear and a 68 tooth ring gear. The sections are joined by a sprag clutch that restricts rotation of the sun gear to one direction. Run the air servo jam nut and o-ring up the threads on the servo. 1.25% Uses compound 25 and 29 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. 1.46% - Uses 22 tooth planet gears, a 37 tooth sun gear and a 80 tooth ring gear. Street and Drag Racing Transmissions - Engine Builder Magazine Shown with our boat bellhousing. Adjustment: The ST1200 also utilizes aircraft quality bearings where the pure-race CS2 uses aerospace spec components. Although there have been many attempts to create similar shifters for stock-type transmissions, Chevy enthusiasts have long aspired to duplicate the multi-lever design of the Lenco for their hot street machines. Recommended for cars making up to 1200 HP the ST1200 is pure LENCO through and through. Every track differs from day to day or hour to hour. 3 Speed with single brg and std output: 23.375". They opted to use the Lenco ST-1200 as it would be a great opportunity to show the tranny's durability and strength by running the truck on both the track and street. This is what comes standard in most new LENCO transmissions. Gear Ratio Reducer Ourblue,greenandtandisc are supplied new at approximately .058"- .061" thickness. 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. 1.31%Uses 27 tooth planet gears, a 25 tooth sun gear and a 80 tooth ring gear. With a docile nature and racing pedigree, the new ST1200 improves upon the old, making a great transmission even better with improved technology, refined parts, and lower rotational mass for faster acceleration. The arm must be free to move in all directions. gearset/ratio and when connected to additional cases multiple ratios are realized. First gear is the furthest lever from the driver with higher gears being the nearest levers. We supply premium grade bearings in the ST1200 instead of the much more expensive aerospace-spec bearings as used in our race transmissions. Easy to use and necessary for fine tuning Toploader 4 speed shifter tech | Pirate 4x4 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. Now rotate counter clockwise 1/2 to 1 turn and tighten lock nut. The Lenco Racing Lencodrive is the automatic answer for people who prefer torque converter/automatic transmission applications. Call our technical department at (909) 673-9080 or email us here with any questions you may have concerning function or applications. It has a selected gear ratio, and is the first speed of the transmission that is translated to the output shaft that drives the wheels. Once installed, make sure the air servo is loose and can turn freely. Its used to force the gear set to make ratio by preventingthe sun gear from rotating in one direction. Each LENCO transmission is thus a two-speed and is housed in its single dedicated case. Magnesium cases are used for both the CS2, CS3 and CS4. One variation is that the ST1200 uses budget-friendly 8620 alloy for the gears instead of the more expensive 9310 material. Warning: Do Not over tighten set screw. All Rights Reserved. Section upon section are bolted together until the transmission takes shape, growing taller than the technician building it. Lencodrive 4 Speed. Gears that mesh easier suffer from less resistance, which leads to higher efficiency and less parasitic loss. 1.31% - Uses 27 tooth planet gears, a 25 tooth sun gear and a 80 tooth ring gear. It is also 2-lbs lighter for lower rotational mass which translates to quicker acceleration. the shift pressure to maintain desired wheel speed and traction. 1.19% Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. .. All Lenco coupler clamps are machined from 7075 aircraft grade aluminum. 1.405%Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 tooth ring gear. For additional information about Lenco products please email us here, or call us at (909) 673-9080. Magnesium Case. For example, a three speed requires two cases. Most popular with Sand Dragsters, Mud racers and Modified pullers. A G-force or Liberty face plated 4 speed may be what you want. LENCO racing transmission is a smaller, lighter and more compact version of our CS1 Standard Design. The middle case would also contain a 1.37 planet gear set. 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. 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 Lenco CS1 Assembly Help | Yellow Bullet Forums - Uses 22/38 tooth planet gears, a 24 tooth sun gear and an 84 tooth ring gear. 1.29, 1.35, and 1.41 gear ratios have been added making a larger list of eight selectable gear ratios. Skilled drivers can perform a clutchless shift without hurting their transmission, but it does take a little bit of a learning curve to get there. Material Gears. This is what comes standard in most new LENCO transmissions. 1.21% Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear. Lenco downshifting - YouTube Building a Lenco ST1200 starts with constructing the soul of the transmission: assembling its planetary gear sets. The arm is held into the servo piston by a set screw. Air or Lever Shift. automatic, I purchased the trans disassembled and do not have the shim configuration shown in the drawing. Stay up to date with news and promotions by signing up for our monthlly newsletter. Lenco has gone through a lot of changes in the past year, with a new owner and new location, the team at Lenco set out to redesign, revamp, and redefine the ST1200 street transmission as the new . 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. The internal action of a LENCO is such that when the transmission is in first gear the chosen planet gear assembly provides the launch ratio. Screw air servo counter-clockwise about five or six turns before you reassemble the transmission. 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. All Rights Reserved. The Lencodrive is available with your choice of all popular bellhousing patterns as well as any starter pocket positioning. Other refinements are O-ring seals that replaced the the gasket seals between the transmission casings. 1.44% Uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear. Input shaft. The Lencodrive is the shortest and lightest torque converter driven transmission available anywhere. All cases are magnesium. There are a variety of both manual and CO2 servo tower designs. Th.. It only has two moving parts, the belt itself and a shaft that connects it to other components in the vehicle or machine. Jeff says that he loves the transmission and "the only thing different [from driving a traditional gearbox] is that there is no engine braking". Originally the ST1200 was only offered with a selection of five gear ratios (1.25, 1.31, 1.38, 1.44, and 1.48). Shims before and after the shifter plate assembly -. Low drag (angluar contact and needle bearings). Then, continue to screw air servo Out (counter-clockwise) one half turn. 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. It uses a clutch and flywheel assembly only to engage the transmission into first and reverse . Second gear ratio is 1.80 and third gear is a 1.31 ratio. Due to the way they are designed and operate, the advantages are clear. A perfect replacement for expensive breakage prone Powerglides, Turbos, C4, C6 style and Torqueflite transmissions the Lencodrive is 100% Lenco. Add bellhousing depth to above lengths for total length: Lenco aluminum, Titanium or Browell steel: 7.200". 1.338% Uses 24 tooth planet gears, a 25 tooth sun gear and a 74 tooth ring gear. 1.31% Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. The planet gears are driven by an encompassrng flng gear. The choice is yours. Second gear ratio is 1.80 and third gear is a 1 .31 ratio. The planetary carrier that is holding the sun gear and planetary gears and clutch pack is placed inside the ring gear. It was . Those two speeds are (1) the lower underdrive ratio and (2) the direct 1:1 final lock-up drive ratio. 1.338%Uses 24 tooth planet gears, a 25 tooth sun gear and a 74 tooth ring gear. Reverse Lockout. When the transmission is shifted a clutch pack compresses the rotating sun gear assembly to the direct drive central sun gear. Copyright 2020, Lenco Racing. The ST1200 gives you the advantage of Lenco brute strengthat a lesser price than our full race units. Mountains Garage: How To Shift A Lenco Racing Transmission

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