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how to shift a lenco transmission

    how to shift a lenco transmission

    Shift pressure is adjustable, whether it be for one case, all cases or anindividual case in a multiple case configuration. All three units shifted equal final drive ratio of 1:1. 1.25% Uses compound 25 and 29 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. You may choose any conventional input shaft spline. Rotate air servo into case until you see the set screw in the air servo piston boss inside the case. transmission, Upshifting is very commonly done this way, but you can also do it while downshifting. and control slippage. 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. Building a Lenco ST1200 starts with constructing the soul of the transmission: assembling its planetary gear sets. 1. 1.23%Uses 21/30 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. 1.20%Uses 22/32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. This change cut down weight substantially which added to the overall rotational mass reduction. Assemble next section on to case and bolt tight. Lenco celebrates over forty-five years of the engineering and manufacturing of the most successful drag racing transmissions ever built. The middle case would also contain a 1.37 planet gear set. The 1 1/4 is the best and used in Top Alcohol and Pro Mod. 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. 2 Speed + reverser with Std output: 17.500". Now rotate counter clockwise 1/2 to 1 turn and tighten lock nut. specific design will suit you best. 1.21% Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear. Jeff says that it took him about two weeks to get used to the multi-lever shifter. Once all cases have been shifted the entire transmission assembly is locked in the final 1:1 direct drive ratio. The three speed is approximately 135 lbs. 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. Planetary gear sets have two speeds. Air shifted LENCOS come pre adjusted from the factory. Shift with either our patentedmulti lever system or with the optional, more compact CO2 setup. The Lenco Racing Lencodrive is the automatic answer for people who prefer torque converter/automatic transmission applications. Additionally, the Lencodrive's main valve body is machined from billet components and is not the typically modified OEM Detroit component. the sun gear from rotating in one direction. 1.28%Uses 32 tooth planet gears, a 25 tooth sun gear and a 89 tooth ring gear. A large sprag clutch is attached on to the sun gear of the planetary carrier finishing the transmission section. Copyright 2020, Lenco Racing. All Rights Reserved. For example, a three speed requires two cases. A G-force or Liberty face plated 4 speed may be what you want. Lever or CO2 shift. The position of the shift lever is relative to the application. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . By multiplying thesethree ratios you come up with a 2.46 first gear ratio. Lencodrive 4 Speed. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. The middle case would also contain a 1.37 planet gear set. Then start the tires spinning, now shift the front section so that you are now in high gear. Tags: Once all cases have been shifted the entire transmission assembly is locked in the final 1:1 direct drive ratio. 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. Boat Transmissions and Boat Clutches Multiple speeds are achieved through utilization of multiple cases. 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 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. The CS2 ,CS3, and CS4 The middle case would also contain a 1.37 planet gear set. First you always start with at least one floater and then a clutch disc and repeat ending up with at least one floater. Magnesium cases are used for both the CS2, CS3 and CS4. 1.22%Uses 21/30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear. New and Used Parts The LENCODRIVE is the automatic answer for people who prefer torque converter/automatic transmission applications. First gear is the furthest lever from the driver with higher gears being the nearest levers. A LENCO launch ratio is determined by the sun and planet gear ratio. 1.25% ratio uses 32 tooth planet gears, a 22 tooth sun gear and an 86 thooth ring gear. Once installed, make sure the air servo is loose and can turn freely. Engineered to handle 3500+ HP the Standard Design LENCO is available with up to 5 speeds and comes in a cast magnesium case. Lenco, the all time champion and undisputed leader in the drag racing transmissions. This is not possible with a traditional cluster gear transmission. A perfect replacement for expensive breakage prone Powerglides, Turbos, C4, C6 style and Torqueflite transmissions the Lencodrive is 100% Lenco. The arm must be free to move in all directions. 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. This is a very extreme duty sprag assembly. The original solid steel planetary carrier was also replaced with a two-piece planetary carrier that is part steel and part aluminum. There must be a minimum of .060" to a maximum of .090" of clearance between face of pilot bearing to beginning of clutch spline. I use an electric over air setup to shift my new B and J transmission. Lenco, the all time champion and undisputed leader in the drag racing transmissions. 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. The Lenco Racing Lencodrive is the automatic answer for people who prefer torque converter/automatic transmission applications. This is not possible with a traditional cluster gear transmission. 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. Jeff Turner's street driven 600hp on motor/800hp on a 200-shot of nitrous "race for money" license platted 1966 Pontiac GTO took us for a spin. This is what comes standard in most new LENCO transmissions. Each LENCO transmission is thus a two speed and is housed in one dedicated two speed. This pressure adjustability gives you considerable control when 3 Speed with single brg and std output: 23.375". Warning: Do Not over tighten set screw. 1.46%Uses 22 tooth planet gears, a 37 tooth sun gear and an 80 tooth ring gear. We can supply practica.. Lenco Racingthrowout bearing collars are machined from premium aircraft grade billet aluminum .. 1.19%Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. The counter shaft has fixed associating gears that are permanently meshed with the loosely connected gears on the output shaft. 9. No further adjustments are necessary as there is ample reserve travel in the servo. The ST1200 is the same engineering design as the all-out-race New Generation CS2 but with a couple of minor differences. If you have a car that you drive to the store on Monday and to the drag strip on Sunday, the only hard question that you have to ask yourself is: Do you prefer anodized or clear? 1.256%Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear. Second gear ratio is 1.80 and third gear is a 1.31 ratio. 1.479% Uses 19 tooth planet gears, a 35 tooth sun gear and an 73 tooth ring gear. You can expand to 3 or 4 speeds by addition of additional cases. Now rotate counter clockwise 1/2 to 1 turn and tighten lock nut. 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. Since each case contains one gearset and provides both underdrive and direct drive,multiple cases (gearsets) provide multiple underdrive ratios. A first-to-fourth skip-shift solenoid is used on the transmission to help increase fuel economy. The CS2 ,CS3, and CS4 LENCO racing transmission is a smaller, lighter and more compact version of our CS1 Standard Design. 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. Every track differs from day to day or hour to hour. It is not necessary for the driver to disengage the clutch when shifting from ratio to ratio. racing transmission, 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. The possible combinations are endless! Air servo or max-adjust shift tower and lever. 1.38% Uses 23 tooth planet gears, a 28 tooth sun gear and an 74 tooth ring gear. When setting up your clutch packs they need to have the proper air gap or clutch pack clearance. The arm is held into the servo piston by a set screw. (only on CS-1 style or center shift transmissions): Air shifted LENCOS come pre adjusted from the factory. Instead of molten aluminum being poured into a mold cavity making a casting, Lenco makes the new transmission casings out of a solid block of aluminum that is cut down by endmills. Chevy Pilot Bearing Assembly 1955-2000 Chevrolet (SB & BB), and Lenco transmissions. Copyright 2020, Lenco Racing. Lenco, the all time champion and undisputed leader in the drag racing transmissions. Once engaged, the gears are shifted without a clutch. 1.566%Uses 18 tooth planet gears, a 45 tooth sun gear and an 81 tooth ring gear. 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. 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. lntroduced in 1972 as a 2-speed the Standard Design LENCO is our largest and strongest transmission. 1.280%Uses 27 tooth planet gears, a 21 tooth sun gear and a 75 tooth ring gear. View the whole process and start at the beginning. The shifting process removes multiplication factors and subsequently results in all gear-sets, after 1.41% - Uses 24 tooth planet gears, a 34 tooth sun gear and a 83 tooth ring gear. There are two different size air servos for the New Generation transmissions. Th.. The simplicity also makes them easy to repair if something goes wrong . When the transmission is shifted a clutch pack compresses the rotating sun gear assembly to the direct drive central sun gear. Light weight components. from DarkSide Here's some fuzzy footage showing the operation. 1.38%Uses 23 tooth planet gears, a 28 tooth sun gear and a 74 tooth ring gear. Low drag (angluar contact and needle bearings). There are a variety of both manual and CO2 servo tower designs. A perfect replacement for expensive breakage prone Powerglides, Turbos, C4, C6 style and Torqueflite transmissions the Lencodriveis 100% Lenco. Thus a 1:1 ratio is achieved. Warning: Do Not over tighten set screw. Remove fill plug on top the transmission case you are going to adjust. 1.25% - Uses 34 tooth planet gears, a 23 tooth sun gear and a 91 tooth ring gear. The Lencodrive does not require a containment blanket unless you use a supercharger or alternative fuels. I've mounted it where It's most comfortable for me. To demonstrate the inner workings of the Lenco ST-1200 transmission, we followed along as one was being assembled for use in Truckin' Magazine's World's Fastest Street Legal Pickup. 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. Enough to make the run and turnoff before it releases. The choice is yours. 1.356% Uses 23 tooth planet gears, a 26 tooth sun gear and a 73 tooth ring gear. If you already have a ST1200, you can upgrade your transmission with the new parts, ratios, and even new casing as all of the new upgraded components are compatible with the older units. Once determined, these gear configurations are assembled in their planetary carriers. 1.25%(Small shaft gearset) Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear. Lenco Parts and Price List isavailable here. Shift with either our patented. This transmission can be used to drive your hot rod to work Monday through Friday and then to the dragstrip and the winner's circle on weekends. This will allow for free play in the shift system. No alterations to the transmission, other than the external operating system itself, are required. The 4-speed above shows how to determine drive ratios. The Lencodrive is the shortest and lightest torque converter driven transmission available anywhere. 1.28% Uses 32 tooth planet gear, a 25 tooth sun gear and an 89 tooth ring gear. Lenco Transmissions Tech. A perfect replacement for expensive breakage prone Powerglides, Turbos, C4, C6 style and Torqueflite transmissions the LENCODRIVE is 100% LENCO and will handle 2500 HP with ease. All Rights Reserved. To install lever remove bolt, insert lever in shift tower so that it faces forward and install bolt. This L.. Purchase the complete LENCO bell housing assembly or individual bellhousing components as needed. In the example of a four speed, the case nearest the engine would contain a 1.37 ratioplanet gear set. Screw air servo into case until it bottoms out against the jam nut. The second lever, and second tallest, is used for third gear. See(input diagram). 4 speed. This gadget employed three shift levers to accomplish everything that a single lever could do. The sections are joined by a sprag clutch that restricts rotation of the sun gear to one direction. 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. 1.438% Uses 20 tooth planet gears, a 32 tooth sun gear and a 73 tooth ring gear. The Sprag clutch is utilized in each shiftable section of the LENCO with the exception of the reverse. Reverse is a small black lever. 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. 1.256% Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear. 1.20%Uses 22/32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. The shift lever is almost the same height as the standard 5th gear lever. First you need to determine which style clutch packs you are working onsee chart. 4,600. Easy to use and necessary for fine tuning 1.21%Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 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. You will need to add a LENCO reverse unit in order to back up. Rotate air servo into case until you see the set screw in the air servo piston boss inside the case. 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. This will allow for free play in the shift system. Other sections are added in a similar way: parts are pressed into casings, gears are added, and sections are bolted together in a repetitious manner. The rear case a 1.31 ratio gearset. Lenco celebrates over forty-five years of the engineering and manufacturing of the most successful drag racing transmissions ever built. 1.356%Uses 23 tooth planet gears, a 26 tooth sun gear and a 73 tooth ring 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. LENCO transmissions are shipped with the shift levers removed in order to prevent damage during shipping. It uses a clutch and flywheel assembly only to engage the transmission into first and reverse gears. 1.20% Uses compound 22 and 32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. 1.20% Uses 22/32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. Attach air lines and your race ready. If the shift pressure is set to your application lock the jam nut your finished, if not you then need to add shim to raise pressure or subtract shim to reduce pressure. 1.368% Uses 21 tooth planet gears, a 25 tooth sun gear and an 74 tooth ring gear. Air or manual shift. 1 position forward selects 1st gear, then 2nd gear is selected by . Do Not Over Tighten. With a simple shift pressure adjustment you can easily compensate Throwout bearing collar (4 & 5-speed only). This is an in-car shot video of Mike drag racing his 73 Duster using a clutch-less Lenco Transmission. The CS1, CS2, CS3 and CS4 transmissions provide the perfect solution for harnessing the unique HP and torque output of boat engines. This is a very extreme duty sprag assembly. Lenco Parts and Price List isavailable here. Again, in an effort to increase fuel economy, Vipers ship with tall 3.07:1 final drive ratios. The CS1 planetary gear size is 1". The planet gears are driven by an encompassing ring gear. 1.31% ratio uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. Manual 2 Speed with Neutral Safety [DRIVE-2-S], Manual 3 Speed with Neutral Safety [DRIVE-3-S], Manual 4 Speed with Neutral Safety [DRIVE-4-S], Lockout Shift with Neutral Safety [DRIVE-L-S]. Sight through plug hole, where you will see the outer edge of the rotary shift plate. 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. To select any gear (ie 1st gear) the other two levers (3/4th & reverse) must be in the neutral (center) position. direct drive - with reverser / Cannon to control clutch arm position, 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. 1.35% Uses 26 tooth planet gears, a 28 tooth sun gear and a 80 tooth ring gear. 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). If it is necessary to remove the servos you should reinstall with the lock nut spun completely to the top of its travel. 3/4" Gear Set. 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. 1.68% Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear.

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