The tallest to the right is used to shift the transmission from first to second gear. Assemble next section on to case and bolt tight. 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. Different Sizes -LENCO utilizes several different styles and sizes of sprags depending on which application the transmission is used for. Multiply the two rear case gearset ratios to determine the second gear ratio of 1.80:1. In order to achieve an underdrive first gear launch ratio the LENCO transmission relies on planet gears which rotate around the sun gear. Call our technical department at (909) 673-9080 or email us here with any questions you may have concerning function or applications. 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. 1.22%Uses 38 tooth planet gears, a 22 tooth sun gear and a 98 tooth ring gear. It also allowed Lenco to shave as much weight as possible from the finished part. 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. This pressure adjustability gives you considerable control when 1.68% Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . Lenco Clutch Disk Alignment Tools areavailable in black anodized billetaluminum. 150 is the usual middle starting point. 1.41% Uses 23 tooth planet gears, a 32 tooth sun gear and a 79 tooth ring gear. Lenco transmissions essentially combine the best of a manual and automatic transmission into one unit. This is a 1971-72 901 transmission converted for use as a side shift 914 gearbox. The rear case a 1.31 ratio gearset. The total amount of gear reduction depends on the amount of housings and the overall application of the transmission. The shift lever is almost the same height as the standard 5th gear lever. 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. Uses 225mm clutch pack in a reverse. ln general, all Lenco transmissions are a planetary design. 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). 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. Copyright 2020, Lenco Racing. Tags: 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. drag racing, 1.48% ratio uses 22 tooth planet gears, a 40 tooth sun gear and an 83 tooth ring gear. This change cut down weight substantially which added to the overall rotational mass reduction. The CS2 ,CS3, and CS4 LENCO racing transmission is a smaller, lighter and more compact version of our CS1 Standard Design. The Lencodrive is pure Lenco through-and-through with the same gearset components as our CS2. The Lenco Racing Lencodrive 2 Speed Automatic Transmission represents our response to people who hav.. The three speed is approximately 135 lbs. There are two different size air servos for the New Generation transmissions. You achieve more than two speeds by combining multiple casesFor example, a three speed requires two cases, A four speed requires three cases, A five speed requires four cases and a six speed requires five cases. Warning: Do Not over tighten set screw. All three units shifted equal final drive ratio of 1:1. The final section is the reverser. 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. These four gears (sun gear and three planet gears) sit in a planetary carrier that holds them together as a unit. The sections are joined by a sprag clutch that restricts rotation of the sun gear to one direction. 1.38% ratio uses 23 tooth planet gears, a 28 tooth sun gear and a 74 ytooth ring gear. Transmission Bruno or lencodrive | InsideTopAlcohol Race prepped Hydramatic. If you want to go straight to the action, skip to around 2:20. To select any gear (ie 1st gear) the other two levers (3/4th & reverse) must be in the neutral (center) position. Due to the way they are designed and operate, the advantages are clear. 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. Shifters - Lenco Racing Transmissions Screw air servo counter-clockwise about five or six turns before you reassemble the transmission. Lenco, the all time champion and undisputed leader in the drag racing transmissions. 1.19%Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. shift pressure control. Clutchless Transmission - Liberty's Gears Each LENCO transmission is thus a two speed and is housed in one dedicated two speed case. No further adjustments are necessary as there is ample reserve travel in the servo. The original transmission was and is still a bulletproof transmission for the street/strip crowd. 1.29, 1.35, and 1.41 gear ratios have been added making a larger list of eight selectable gear ratios. Here's some fuzzy footage showing the operation. Once you have achieved the proper clearance reinstall the pressure plate spring and clutch housing snap ring it is then complete, ready for installation. Run air servo jam nut and o-ring down against the case and tighten with a 1 1/2" wrench. and control slippage. It is bolted to the end of the transmission with a splined output shaft which will await the driveshaft yoke. the shift pressure to maintain desired wheel speed and traction. Its used to force the gear set to make it's ratio by preventing the sun gear from rotating in one direction. Equipped with a Lenco ST1200 5-speed transmission, Jeff regularly drives his car on the streets around his home in Oceanside, CA. 3 Speed + reverser with Std output: 24.000". Think of it as manually shifting an automatic transmission. In the example of a four speed, the case nearest the engine would contain a 1.37 ratioplanet gear set. When this same section is shifted the Sprag then allows the sun gear to rotate in the same direction as the crankshaft. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. Attach air lines and your race ready. It's capacity is much stronger than the small sprag. Screw air servo into case until it bottoms out against the jam nut. Most popular with Sand Dragsters, Mud racers and Modified pullers. Take the Hurst Lightning Rods, an aftermarket performance shifter marketed in the 1980s. Multiply all three gearset ratios to determine the first gear ratio of 2.46:1. The Lencodrive is available with your choice of all popular bellhousing patterns as well as any starter pocket positioning. contain a 1.37 ratio planet gear set. To add more speeds to a planetary transmission you add more sections. Multiple speeds are achieved through utilization of multiple cases. Shifters and lockouts can be either style. 1.50%Uses 22 tooth planet gears, a 44 tooth sun gear and an 88 tooth ring gear. If, however, the track is loose from 300 through 500 you can soften A large sprag clutch is attached on to the sun gear of the planetary carrier finishing the transmission section. When doing burnout's you need to roll up to the water box then shift all sections accept the front section. . 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. Aside from manufacturing benefits, it also gives customers a finished piece that looks more like jewelry than an automotive part. Magnesium cases are used for both the CS2, CS3 and CS4. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. The Lencodrive will accept virtually any manufacturer's torque converter. Air servos or max-adjust shift towers. Mountains Garage: How To Shift A Lenco Racing Transmission Stay up to date with news and promotions by signing up for our monthlly newsletter. The Sprag clutch is utilized in each shiftable section of the LENCO with the exception of the reverse. Those two speeds are (1) the lower underdrive ratio and (2) the direct 1:1 final lock-up drive ratio. 1.50% - Uses 17 tooth planet gears, a 34 tooth sun gear and a 68 tooth ring gear. 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. The second lever, and second tallest, is used for third gear. Going to high on the pressure shocks the transmission and drive-train. Lenco Transmissions Tech. Warning: Do Not over tighten set screw. 1.25% Uses compound 25 and 29 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. This synchronizing gear is pushed onto the teeth of one of the two drive gears that it sits in-between, matching its speed and locking it into place. 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. 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. By multiplying these three ratios you come up with a 2.46 first gear ratio. Copyright 2020, Lenco Racing. This is how we engage gears in a traditional manual transmission. There is also a blue disc and a tan disc both of these styles come in one size. The ST1200 allows Jeff to control how hard his transmission shifts by changing how fast he pulls on the levers. racing transmission, This L.. Lenco Clutch Disk Alignment Tools areavailable in black anodized billetaluminum. We are able to offer the ST1200 Street/Strip at lower cost than our pure race CS1, CS2, CS3 and CS4 designs since we use 8620 steel instead of 9310 material for the ST1200 gears. 2 Speed with single brg and std output: 16.875". Gears attached to the output shaft are loosely connected. Jeff says that he loves the transmission and "the only thing different [from driving a traditional gearbox] is that there is no engine braking". 1.20% Uses compound 22 and 32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. 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. Lenco's transmissions can either be manually shifted or gas shifted with CO2. If the first 300 feet of track is excellent, for instance, full shift pressure and instant lock-up may be desired. A BorgWarner T56 six-speed transmission was used in the Viper; automatics have never been available. 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. It is also 2-lbs lighter for lower rotational mass which translates to quicker acceleration. I've made provision, so that shift lever can be moved to the back of the trans quite easily. The CS1 will control up to 3000 HP. The CS2 handles up to 3000 HP; CS3 and CS4 1800 HP. If needed you may vary 1 full turn up or down from your 2 turns out in order to achieve the shift pressure desired. 1.31% ratio uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. Air shifted LENCOS come pre adjusted from the factory. Each lever controls one planetary gear set. - Uses 28/38 tooth planet gears, a 23 tooth sun gear and a 91 tooth ring gear. Lenco, the all time champion and undisputed leader in the drag racing transmissions. It's capacity is much stronger than the small sprag. No alterations to the transmission, other than the external operating system itself, are required. 1 position forward selects 1st gear, then 2nd gear is selected by . Lenco CS1 Assembly Help | Yellow Bullet Forums Screw the servo into the transmission case until contact is made with the shift fork pin. Do Not Over Tighten. This is an in-car shot video of Mike drag racing his 73 Duster using a clutch-less Lenco Transmission. We recommend that you discuss your application with our technical representatives and follow their suggestions on which Once engaged, the gears are shifted without a clutch. Th.. Chevy Pilot Bearing Assembly 1955-2000 Chevrolet (SB & BB), and Lenco transmissions. Each case in succession, with its particular underdrive ratio, determines the immediate drive ratio. The Sprag clutch is utilized in each shiftable section of the LENCO with the exception of the reverse. Both ATF and engine oil supply the required amount of lubrication and cooling for a Lenco transmission. Yes, there are 18 different car gearbox types - MSN 1.56% Uses 22 tooth planet gears, a 55 tooth sun gear and a 98 tooth ring gear. With its modular design, an infinite number of speeds can be added. We do offer different thickness floaters for correcting the clutch pack clearance. multi lever system or with the optional, more compact CO2 setup. To install lever remove bolt, insert lever in shift tower so that it faces forward and install bolt. When you select a gear, the gear shaft moves a synchronizing gear that looks like a toothed collar.