how to shift a lenco transmission

Lenco, the all time champion and undisputed leader in the drag racing transmissions. The 2 speed, including reverse, bellhousing and lining weighs approximately 108 lbs. 5.6K views, 84 likes, 1 loves, 13 comments, 17 shares, Facebook Watch Videos from Lenco Racing Transmissions, Inc.: David answers a few FAQ on CS-1 thru CS-4 Transmissions 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. (only on CS-1 style or center shift transmissions): 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. Three planetary gears rotate around the sun gear like planets traveling in their orbit. 1.38% Uses 23 tooth planet gears, a 28 tooth sun gear and an 74 tooth ring gear. Polishing the shift fork helps a lot for consistent shifts. The rear case a 1.31 ratio gearset. Magnesium case is standard. Multiply the two rear case gearset ratios to determine the second gear ratio of 1.80:1. Purpose designed and produced for drag, ski and river boat requirements. The second lever, and second tallest, is used for third gear. 1.48% ratio uses 22 tooth planet gears, a 40 tooth sun gear and an 83 tooth ring gear. When locked, the gear's ratio is translated to the output shaft as the gear and the output shaft are now fixed. 1.34% - Uses 24 tooth planet gears, a 25 tooth sun gear and a 74 tooth ring gear. bellhousing patterns - Ford, GM, MoPar and our own five-bolt design. 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, R577980 Raybestos Gen2 (Blue) The arm must be free to move in all directions. CS-1 style or center shift transmissions: Copyright 2020, Lenco Racing. 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. (2) it is easier to work on the bruno/lenco . A five speed requires four cases, and a six speed requires five cases. Second gear ratio is 1.80 and third gear is a 1.31 ratio. When discs wear to .052" or less they must be replaced. Lenco celebrates over forty-five years of the engineering and manufacturing of the most successful drag racing transmissions ever built. You always need to come out of the water box in high gear to prolong the life of the transmission. 1.22%Uses 21/30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear. In general, all LENCO transmissions are a planetary design. The rear case a 1.31 ratio gearset. 1.479%Uses 19 tooth planet gears, a 35 tooth sun gear and an 73 tooth ring gear. The ST1200 allows Jeff to control how hard his transmission shifts by changing how fast he pulls on the levers. Hurst's inspiration for the Lightning Rods was the Lenco transmission (above) used in drag racing in those years, notably in the NHRA Pro Stock category. 1.368% Uses 21 tooth planet gears, a 25 tooth sun gear and an 74 tooth ring gear. 3 Speed with single brg and std output: 23.375". When the transmission is shifted a clutch pack compresses the rotating sun gear assembly to the direct drive central sun gear. 300M Input/Cluster Shafts. As with all Lenco transmissions the ST1200 is a planetary design and comes with up to 6 forward speeds. The internal action of a LENCO is such that when the transmission is in first gear the dedicated planet gear assembly provides the launch ratio. The air servo is attached to a rotary shift plate by an adjustable arm which is pre-set by the factory and should NOT be changed. Since each case contains one gearset and provides both underdrive and direct drive, multiple cases provide multiple underdrive ratios. In the example of a four speed, the case nearest the engine would contain a 1.37 ratioplanet gear set. Unlike a traditional manual transmission with its singe shifter, planetary transmissions have multiple levers which are used to shift the transmission. 1.256% Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear. If it takes over one second to reach full pressure at the pod, you have a restriction (regulator, line, button). The result is LENCO quality and durability at a reasonable "Street Machine" price. Ourblue,greenandtandisc are supplied new at approximately .058"- .061" thickness. Available in either bare aluminum (clear) or hard anodized black finish, you can choose the transmission finish that best suits your style; however, Lenco highly recommends the standard hard anodized black finish as transmissions usually live a hard life underneath a car where no one can see it, and where it is subject to lots of splashing and hits from rocks and other road debris. The next lever is used for fourth gear and final lever for fifth. Its used to force the gear set to make it's ratio by preventing the sun gear from rotating in one direction. 1.44% Uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring 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. There are a variety of both manual and CO2 servo tower designs. The tallest to the right is used to shift the transmission from first to second gear. Chevy Pilot Bearing Assembly 1955-2000 Chevrolet (SB & BB), and Lenco transmissions. We achieve more than two speeds by assembly of multiple cases. 1.21%Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear. Upshifting is very commonly done this way, but you can also do it while downshifting. 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. 1.438% Uses 20 tooth planet gears, a 32 tooth sun gear and a 73 tooth ring gear. Lenco Transmissions Tech. The ST1200 comes with aluminum cases instead of the magnesium style race units. The position of the shift lever is relative to the application. 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. Since all LENCO transmissions utilize the same internal gearing design you can easily change from a manual shift set 3 speed. All Rights Reserved. LENCO transmissions are shipped with the shift levers removed in order to prevent damage during shipping. Run the air servo jam nut and o-ring up the threads on the servo. 1.41%Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 tooth ring gear. Once installed, make sure the air servo is loose and can turn freely. Thus a 1:1 ratio is achieved. In order to achieve an underdrive first gear launch ratio the LENCO transmission relys on planet gears which rotate around the sun 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. 1 position forward selects 1st gear, then 2nd gear is selected by . at a lesser price than our full race units. Warning: Do Not over tighten set screw. 3 Speed + reverser with Pro output: 25.000". Copyright 2020, Lenco Racing. All three units shifted equal final drive ratio of 1:1. Both transmissions are available in 2,3, 4 or 5 speeds. The Lencodrive is the shortest and lightest torque converter driven transmission available anywhere. Lencodrive 2 Speed. Since the taller ring and pinion have more tooth area contact they are more reliable and less prone to breakage. Lenco transmissions essentially combine the best of a manual and automatic transmission into one unit. Since the 30 wt oil is thicker it takes a . 1.297% Uses 26 tooth planet gears, a 22 tooth sun gear and a 74 tooth ring gear. Attach air lines and your race ready. The Lenco Racing Lencodrive 3Speed Automatic Transmission represents our response to people who have asked for a safe and affordable torque converter driven transmission. Lencodrives is a CS-2 transmission. LENCODRIVE Automatic It's capacity is much stronger than the small sprag. The tallest to the right is used to shift the transmission from first to second gear. The Lenco Racing Lencodrive 3Speed Automatic Transmission represents our response to people wh.. As an example, this tranny with a set of 4.30:1 rear axle gears, coupled to 32-inch-tall Mickey Thompson tires should allow any Pro Street Chevy to cruise on the highway, averaging 60 mph at slightly above 2,800 rpms. Call our technical department at (909) 673-9080 or email us here with any questions you may have concerning function or applications. Please click here for CS3 Timing Chart (.pdf). By multiplying these three ratios you come up with a 2.46 first gear ratio. The air servo is attached to a rotary shift plate by an adjustable arm which is pre-set by the factory and should NOT be changed. 1.313%Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. 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. 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. Once engaged, the gears are shifted without a clutch. Lencodrive Options: (option pricing only). Copyright 2020, Lenco Racing. All shifting is done with the engine's clutch engaged. 1.25% Uses compound 25 and 29 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. Material Gears. 1.28% Uses 32 tooth planet gear, a 25 tooth sun gear and an 89 tooth ring gear. All three units shifted equal final drive ratio of 1:1. Shown with our boat bellhousing. The planet gears are driven by an encompassing ring gear. Sight through plug hole, where you will see the outer edge of the rotary shift plate. Large Strips and Clips Sprag Assembly - Thisis a specialized sprag and is used in applications where tire shake is a constant problem. This is first gear. 1.500%Uses 19 tooth planet gears, a 38 tooth sun gear and a 76 tooth ring gear. The 4-speed above shows how to determine drive ratios. Also known as a 'crash' gearbox for the noise it can make with a mis-timed shift, the non-synchromesh transmission is now only usually found in some trucks. Those two speeds are (1) the lower underdrive ratio and (2) the direct 1:1 final lock-up drive ratio. Rotate air servo into case until you see the set screw in the air servo piston boss inside the case. multi lever system or with the optional, more compact CO2 setup. If he shifts slower, the transmission shifts softer; if he shifts faster, the transmission shifts harder. Th.. Additionally, the Lencodrive's main valve body is machined from billet components and is not the typically modified OEM Detroit component. 1.44% - Uses 20 tooth planet gears, a 32 tooth sun gear and a 73 tooth ring gear. We acheive more than two speeds by combining multiple cases. Final drive ratio is 1:1. In order to achieve an underdrive first gear launch ratio the LENCO transmission relys on planet gears which rotate around the sun gear. There is also a blue disc and a tan disc both of these styles come in one size. If the first 300 feet of track is excellent, for instance, full shift pressure and instant lock-up may be desired. Lever or CO2 shift. Multiply the two rear case gearset ratios to determine the second gear ratio of 1.80:1. You may choose any conventional input shaft spline. 1.31% Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. It is sometimes necessary to have an extra floater disc to reach the desired clutch pack clearance and normally the extra floater would go next to the planet case. Leaving the pressure plate spring (wave spring) out, place the pressure plate on top of the clutch pack. Screw air servo counter-clockwise about five or six turns before you reassemble the transmission. transmissions, The next lever is used for fourth gear and final lever for fifth. 1.500% Uses 19 tooth planet gears, a 38 tooth sun gear and a 76 tooth ring gear. The second lever, and second tallest, is used for third gear. Those two speeds are (1) the lower underdrive ratio and (2) the direct 1:1 final lock-up drive ratio. Stay up to date with news and promotions by signing up for our monthlly newsletter. Final drive ratio is 1:1. Light weight components. 1.356% Uses 23 tooth planet gears, a 26 tooth sun gear and a 73 tooth ring gear. With its modular design, an infinite number of speeds can be added. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. 1.25% ratio uses 32 tooth planet gears, a 22 tooth sun gear and an 86 thooth ring gear. Stay up to date with news and promotions by signing up for our monthlly newsletter. 1.73% Uses 14 tooth planet gears, a 76 tooth sun gear and a 104 tooth ring gear. and anodized for corrosion and galling protection. It's a transmission that will set any street/strip car apart from the competition, with performance to match its new all-aluminum billet CNC looks. 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. The CS2 ,CS3, and CS4 You must multiply each cases underdrive ratio in order to determine the first gear ratio. Final drive ratio is 1:1. For more specific information on any of these Lenco transmissions please refer to the Tabs below, or call our tech line at(909) 673-9080. 1.24% Uses 26/31 tooth planet gears, a 23 tooth sun gear and an 80 tooth ring gear. By multiplying these three ratios you come up with a 2.46 first gear ratio. racing transmission, The simplicity also makes them easy to repair if something goes wrong . John, put a pressure guage at the shifter pod. Since each case contains one gearset and provides both underdrive and direct drive,multiple cases (gearsets) provide multiple underdrive ratios. 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. By multiplying these three ratios you come up with a 2.46 first gear ratio. Shift Patterns: Then, continue to screw air servo Out (counter-clockwise) one half turn. 1.378%Uses 23 tooth planet gears, a 28 tooth sun gear and a 74 tooth ring gear. Despite its reputation among racers and its many uses today, which include everything from boats to alcohol dragsters, many enthusiasts have not caught on to the fact that there IS a street version available. Lenco Racing, the all time champion and undisputed leader in the drag racing. 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. Simply put, once the transmission is in gear, the power runs through a set of planetary gears. 1.56% Uses 22 tooth planet gears, a 55 tooth sun gear and a 98 tooth ring gear. The CS1 Standard Design LENCO is recommended for the most severe applications and is capable of repeatable consistency with a minimum of maintenance. Due to the way they are designed and operate, the advantages are clear. The dual clutch manual transmission is simply fast. 1.68% - Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear. 1.24%Uses 26/31 tooth planet gears, a 23 tooth sun gear and an 80 tooth ring gear. Lencodrive 4 Speed. Each gear is engaged by pulling down on the shift lever, to activate the clutch mechanism for each gear set. Here's some fuzzy footage showing the operation. The choice is yours. Once all cases have been shifted the entire transmission assembly is locked in the final 1:1 direct drive ratio. 4,600.

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