1.356%Uses 23 tooth planet gears, a 26 tooth sun gear and a 73 tooth ring gear. 1.73% Uses 14 tooth planet gears, a 76 tooth sun gear and a 104 tooth ring gear. Lenco celebrates over forty-five years of the engineering and manufacturing of the most successful drag racing transmissions ever built. Choice of standard or new generation reverses. LENCO racing transmission is a smaller, lighter and more compact version of our CS1 Standard Design. Each sun and planet gearset represents two speeds. the final shift, being locked to a 1:1 ratio. 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. 1.500%Uses 19 tooth planet gears, a 38 tooth sun gear and a 76 tooth ring gear. and control slippage. Over the years, there have been many in-car-cameras showing Pro Stock drivers grabbing and shifting the trademark five levers as they power their vehicles toward the finish line. The sun gear is the center of the mechanism's universe. View the whole process and start at the beginning. Throwout bearing collar (4 & 5-speed only). 1.28% Uses 32 tooth planet gear, a 25 tooth sun gear and an 89 tooth ring gear. Tags: The gearset in the third case alone, 1.31:1, determines the third gear ratio. 1.405% Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 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. 1.41% Uses 23 tooth planet gears, a 32 tooth sun gear and a 79 tooth ring gear. Copyright 2020, Lenco Racing. 1.38% ratio uses 23 tooth planet gears, a 28 tooth sun gear and a 74 ytooth ring gear. Air servo or max-adjust shift tower and lever. The CS2 ,CS3, and CS4 LENCO racing transmission is a smaller, lighter and more compact version of our CS1 Standard Design. As with all Lenco transmissions the ST1200 is a planetary design and comes with up to 6 forward speeds. Those two speeds are (1) the lower underdrive ratio and (2) the direct'1:1 final lock-up drive ratio. All levers in forward position result in the transmission being in first gear. Thus a 1:1 ratio is achieved. 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. All Rights Reserved. Shims before and after the shifter plate assembly -. 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). 1.68% Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear. All Rights Reserved. 1.56% - Uses 16 tooth planet gears, a 41 tooth sun gear and a 73 tooth ring gear. 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. First you need to determine which style clutch packs you are working onsee chart. 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. With a simple shift pressure adjustment you can easily compensate The sun gear only rotates when it is locked with the ring gear. Screw the servo into the transmission case until contact is made with the shift fork pin. Planetary gear sets have two speeds. The planet gears are driven by an encompassrng flng gear. Do Not Over Tighten. It also allowed Lenco to shave as much weight as possible from the finished part. 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. You always need to come out of the water box in high gear to prolong the life of the transmission. This intermediate shaft connects this planetary gear set to subsequent planetary gear sets which make up the modular nature of this transmission. It is also 2-lbs lighter for lower rotational mass which translates to quicker acceleration. Copyright 2020, Lenco Racing. Building a Lenco ST1200 starts with constructing the soul of the transmission: assembling its planetary gear sets. Material Gears. You may choose any conventional input shaft spline. Air or manual shift. sr1200, CS1 Standard Design If it is necessary to remove the servos you should reinstall with the lock nut spun completely to the top of its travel. By multiplying thesethree ratios you come up with a 2.46 first gear ratio. The counter shaft has fixed associating gears that are permanently meshed with the loosely connected gears on the output shaft. Multiply the two rear case gearset ratios to determine the second gear ratio of 1.80:1. The gearset in the third case alone, 1.31:1, determines the third gear ratio. Multiply all three gearset ratios to determine the first gear ratio of 2.46:1. Screw air servo in (clockwise) until you see the rotary plate start to shift, now screw air servo Out (counter-clockwise) until the rotary shift plate stops moving. 1.44% Uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear. 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. This means that it can run for years without any maintenance and still operate smoothly. 1.22%Uses 38 tooth planet gears, a 22 tooth sun gear and a 98 tooth ring gear. 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. Magnesium case is standard. 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. 1.368%Uses 21 tooth planet gears, a 25 tooth sun gear and an 74 tooth ring gear. Lenco CS1 Assembly Help | Yellow Bullet Forums By multiplying these three ratios you come up with a 2.46 first gear ratio. 1.48% ratio uses 22 tooth planet gears, a 40 tooth sun gear and an 83 tooth ring gear. 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. Jeff says that it took him about two weeks to get used to the multi-lever shifter. Lenco trans oil ? | InsideTopAlcohol 1.16% Uses 21/36 tooth planet gears, a 22 tooth sun gear and a 79 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. lenco cs3 5 speed. This gadget employed three shift levers to accomplish everything that a single lever could do. 9. 1.31% ratio uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. Run air servo jam nut and o-ring down against the case and tighten with a 1 1/2" wrench. Three planetary gears rotate around the sun gear like planets traveling in their orbit. word-day-lightning-rods | News | Grassroots Motorsports All LENCO transmissions operate in basically the same way and if you have any questions about servicing your trans please call our tech line at (909) 673-9080. 1.20%Uses 22/32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. Th.. We offer Turbo 400, C6, Mega and standard Powerglide size input shafts per your requirements. 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 Lenco revamped the ST1200, by replacing sand molds with CNC 5 and 6-axis milling machines. 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. Shift pressure is adjustable, whether it be for one case, all cases or anindividual case in a multiple case configuration. 1.35% Uses 26 tooth planet gears, a 28 tooth sun gear and a 80 tooth ring gear. 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. It only has two moving parts, the belt itself and a shaft that connects it to other components in the vehicle or machine. If it is necessary to remove the servos you should reinstall with the lock nut spun completely to the top of its travel. CS2, CS3, CS4 & Lencodrive or offset shift transmissions: The 4-speed above shows how to determine drive ratios. Attach air lines and your race ready. 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. Screw air servo into case until it bottoms out against the jam nut. of the adjustable shift tower plunger. The Lencodrives come with three different shafts, a Ford, a GM, and a 1 1/4. Light weight ring gears (units w/27 and 32 spline shafts only). The total amount of gear reduction depends on the amount of housings and the overall application of the transmission. To select any gear (ie 1st gear) the other two levers (3/4th & reverse) must be in the neutral (center) position. In general, all LENCO transmissions are a planetary design. The planetary carrier that is holding the sun gear and planetary gears and clutch pack is placed inside the ring gear. The LENCO ST1200 is the answer for Pro Street and street/strip applications. 1.28% - Uses 32 tooth planet gears, a 25 tooth sun gear and a 89 tooth ring gear. We acheive more than two speeds by combining multiple cases. Magnesium Tailhousing (Bushing or Roller Bearing) 300M 32-Spline Output Shaft. The ST1200 also utilizes aircraft quality bearings where the pure-race CS2 uses aerospace spec components. The position of the shift lever is relative to the application. Stay up to date with news and promotions by signing up for our monthlly newsletter. Large low drag bearings, that the planetary gears will float on, are pressed into the casings. Reverse lever. If, however, the track is loose from 300 through 500 you can soften Large Strips and Clips Sprag Assembly - Thisis a specialized sprag and is used in applications where tire shake is a constant problem. No further adjustments are necessary as there is ample reserve travel in the servo. 1.479%Uses 19 tooth planet gears, a 35 tooth sun gear and an 73 tooth ring gear. New and Used Parts Screw air servo into case until it bottoms out against the jam nut. The middle case would also contain a 1.37 planet gear set. As with all Lenco transmissions the ST1200 is a planetary design and comes with up to 6 forward speeds. 1.29, 1.35, and 1.41 gear ratios have been added making a larger list of eight selectable gear ratios. 4 speed. Furthermore the Lenco allows you to achieve 3,000-rpm launches at the track and 1,000-rpm take-offs from the stoplight, depending on how long you leave your foot on the clutch. Second gear ratio is 1.80 and third gear is a 1.31 ratio. Its used to force the gear set to make it's ratio by preventing the sun gear from rotating in one direction. All transmissions are the sum of their parts. This is a 1971-72 901 transmission converted for use as a side shift 914 gearbox. Each gear is engaged by pulling down on the shift lever, to activate the clutch mechanism for each gear set. 1.35% Uses 26 tooth planet gears, a 28 tooth sun gear and a 80 tooth ring gear. 1.256% Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear. 1.16%Uses 21/36 tooth planet gears, a 22 tooth sun gear and a 79 tooth ring gear. When the installed lever is loose that section is in low and when the lever is tight the sections in high. automatic, When you select a gear, the gear shaft moves a synchronizing gear that looks like a toothed collar. Since each case contains one gearset and provides both underdrive and direct drive, multiple cases provide multiple underdrive ratios. The Lencodrive does not require a containment blanket unless you use a supercharger or alternative fuels. <lol> Trust me, It's no where near shoulder height ! If you want to go straight to the action, skip to around 2:20. It uses a clutch and flywheel assembly only to engage the transmission into first and reverse . Each planetary gear set is in its own housing and carries a higher ratio. There are a lot of variables. You can add additional cases and gearsets that will result in 3 or 4 speeds. Lencodrives is a CS-2 transmission. 1.25%(Small shaft gearset) Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear. all hardware. 9310 steel would be used in Pro Stock, Pro Mod and other similar applications where substantially more HP, torque and tire plant is generated. Competition Eliminator, Super classes, Top Dragster and Pro Stock cars are typical classes where you will find the New Generation LENCO. Lencodrive 4 Speed. V-gate shifter for 4 and 5-speed Lenco | Page 2 | Yellow Bullet Forums When setting up your clutch packs they need to have the proper air gap or clutch pack clearance. How is this done? 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. Recommended for cars making up to 1200 HP the ST1200 is pure LENCO through and through. It's capacity is much stronger than the small sprag. 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.