on October 21, 2023
The three speed is approximately 135 lbs. Each gear is engaged by pulling down on the shift lever, to activate the clutch mechanism for each gear set. Unlike a traditional manual transmission with its singe shifter, planetary transmissions have multiple levers which are used to shift the transmission. Air servos are specific to the type of Lenco you run so be sure to pick the correct one from the drop down menu. In the example of a four speed, the case nearest the engine would contain a 1.37 ratioplanet gear set. Low drag (angluar contact and needle bearings). street transmission, Its used to force the gear set to make it's ratio by preventing the sun gear from rotating in one direction. 1.17% (1.165) - Uses 22/38 tooth planet gears, a 24 tooth sun gear and an 84 tooth ring gear. Race prepped Hydramatic. Once installed, make sure the air servo is loose and can turn freely. 1.313%Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. <lol> Trust me, It's no where near shoulder height ! The total amount of gear reduction depends on the amount of housings and the overall application of the transmission. 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. You can expand to 3 or 4 speeds by addition of additional cases. The rear case a 1.31 ratio gearset. Smaller diameter and shorter length make this transmission a practical choice for use in restricted confines and instances when you have limited distance from the engine to the rear end. The CS1 Standard Design LENCO is recommended for the most severe applications and is capable of repeatable consistency with a minimum of maintenance. Add fluids as necessary and install fill plug. Due to the way they are designed and operate, the advantages are clear. The middle case would also contain a 1.37 planet gear set. Since each case contains one gearset and provides both underdrive and direct drive, multiple cases (gearsets) provide multiple underdrive ratios. Air servos are machined from billet alum. 1.31% ratio uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. Lencodrive 2 Speed. 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. and anodized for corrosion and galling protection. This is a very extreme duty sprag assembly. In order to achieve an underdrive first gear launch ratio the LENCO transmission relys on planet gears which rotate around the sun 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. 1.256% Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear. Lenco, the all time champion and undisputed leader in the drag racing transmissions. You could not make small adjustments, so owners had to be selective in their transmission and rearend gear choices. The rear case a 1.31 ratio gearset. 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. 1.19% (1.191) - Uses 28/38 tooth planet gears, a 23 tooth sun gear and a 91 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. 1.31% Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. 1.50% - Uses 17 tooth planet gears, a 34 tooth sun gear and a 68 tooth ring gear. Assemble next section on to case and bolt tight. Again, in an effort to increase fuel economy, Vipers ship with tall 3.07:1 final drive ratios. 1.48%- Uses 22 tooth planet gears, a 40 tooth sun gear and an 83 tooth ring gear. Recommended for cars making up to 1200 HP the ST1200 is pure LENCO through and through. In general, all LENCO transmissions are a planetary design. 1.56% Uses 22 tooth planet gears, a 55 tooth sun gear and a 98 tooth ring gear. We offer Turbo 400, C6, Mega and standard Powerglide size input shafts per your requirements. 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. Before you install the transmission you must measure the clearance between the pilot bearing end of the input shaft and the rear face of the pilot bearing. The Lenco Racing Lencodrive 3Speed Automatic Transmission represents our response to people who have asked for a safe and affordable torque converter driven transmission. The middle case would also contain a 1.37 planet gear set. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. As with all Lenco transmissions the ST1200 is a planetary design and comes with up to 6 forward speeds. Lenco Clutch Disk Alignment Tools areavailable in black anodized billetaluminum. Additionally, the Lencodrive's main valve body is machined from billet components and is not the typically modified OEM Detroit component. ln general, all Lenco transmissions are a planetary design. Jeff says that he loves the transmission and "the only thing different [from driving a traditional gearbox] is that there is no engine braking". A perfect replacement for expensive breakage prone Powerglides, Turbos, C4, C6 style and Torqueflite transmissions the Lencodrive is 100% Lenco. 1.22%Uses 21/30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear. multi lever system or with the optional, more compact CO2 setup. 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 You must multiply each cases underdrive ratio in order to determine the first gear ratio. 1.31% ratio uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. Once engaged, the gears are shifted without a clutch. The gearset in the third case alone, 1.31:1, determines the third gear ratio. This can cause tire shake. Competition Eliminator, Super classes, Top Dragster and Pro Stock cars are typical classes where you will find the New Generation LENCO. 1.22% Uses compound 21 and 30 tooth planet gears, a 24 tooth sun gear and a 75 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. Screw the servo into the transmission case until contact is made with the shift fork pin. 3 speed. This unique clutch is a very popular replacement for clunky V-drive dog style in-out boxes. Lencodrive 3 Speed. Enough to make the run and turnoff before it releases. 1. jody - even though i don't run a lencodrive and i have 2 bruno/lencos, i believe i can highlite some differences. The 1 1/4 is the best and used in Top Alcohol and Pro Mod. Planetary transmissions, like Lenco, eliminate this inherent design weakness by utilizing planetary gears. lenco air shift options | InsideTopAlcohol Easy to use and necessary for fine tuning 1. Lenco transmissions essentially combine the best of a manual and automatic transmission into one unit. Screw the servo into the transmission case until contact is made with the shift fork pin. Large Strips and Clips Sprag Assembly - Thisis a specialized sprag and is used in applications where tire shake is a constant problem. Remove fill plug on top the transmission case you are going to adjust. This change reduced any chance of casting imperfections and it offered more control over the final product. I purchased the trans disassembled and do not have the shim configuration shown in the drawing. When the installed lever is loose that section is in low and when the lever is tight the sections in high. 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. First you always start with at least one floater and then a clutch disc and repeat ending up with at least one floater. The CS1 planetary gear size is 1". Stay up to date with news and promotions by signing up for our monthlly newsletter. Lenco Drag race car. The Lencodrive is pure Lenco through-and-through with the same gearset components as our CS2. Equipped with a Lenco ST1200 5-speed transmission, Jeff regularly drives his car on the streets around his home in Oceanside, CA. Simply put, once the transmission is in gear, the power runs through a set of planetary gears. The CS-2 is much easier to work on than the CS-1. 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. Lenco, the all time champion and undisputed leader in the drag racing transmissions. 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's capacity is much stronger than the small sprag. The final section is the reverser. A five speed requires four cases, and a six speed requires five cases. To add more speeds to a planetary transmission you add more sections. Magnesium Tailhousing (Bushing or Roller Bearing) 300M 32-Spline Output Shaft. Boat Transmissions and Boat Clutches 1.313% Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. The biggest benefit to Pro Streeters is that you don't have to worry about overheating, flashing the torque converter or other maintenance costs-as there are none. 1.23%Uses 21/30 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. Shift Patterns: 1.23%Uses 21/30 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear. sr1200, Please call for ordering or technical information. All levers in forward position result in the transmission being in first gear. Assemble next section on to case and bolt tight. Since each case contains one gearset and provides both underdrive and direct drive,multiple cases (gearsets) provide multiple underdrive ratios. This L.. Purchase the complete LENCO bell housing assembly or individual bellhousing components as needed. 3 Speed + reverser with Pro output: 25.000". We achieve more than two speeds by assembly of multiple cases. Each case in succession. 1.25% (1.252) - Uses 24/28 tooth planet gears, a 23 tooth sun gear and a 78 tooth ring gear. The counter shaft has fixed associating gears that are permanently meshed with the loosely connected gears on the output shaft. Posted 6 days ago. Screw air servo into case until it bottoms out against the jam nut. Once you have achieved the proper clearance reinstall the pressure plate spring and clutch housing snap ring it is then complete, ready for installation. Lenco Racing | The World's Best Racing Transmissions The ST1200 also utilizes aircraft quality bearings where the pure-race CS2 uses aerospace spec components. Most popular with Sand Dragsters, Mud racers and Modified pullers. 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. Now rotate tower clockwise until it lightly touches pin on shift fork then rotate tower counter clockwise 2 turns and place hook of scale in top hole of checking lever supplied with transmission (this lever should be about 5 1/2" over all length) and pull scale slowly to shift section, taking note of highest reading this is your shift pressure. Second gear ratio is 1.80 and third gear is a 1 .31 ratio. Each lever controls one planetary gear set. 1.19%Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. Lenco Street Transmissions - Super Chevy Magazine - MotorTrend Lenco for street use | Team Chevelle Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. specific design will suit you best. Now rotate counter clockwise 1/2 to 1 turn and tighten lock nut. 1.44% ratio uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear. Lenco downshifting - YouTube 1.41% Uses 23 tooth planet gears, a 32 tooth sun gear and a 79 tooth ring gear. Porsche 911-06 side shift transmission for 914 4 or 6. Add bellhousing depth to above lengths for total length: Lenco aluminum, Titanium or Browell steel: 7.200". LENCO racing transmission is a smaller, lighter and more compact version of our CS1 Standard Design. I've mounted it where It's most comfortable for me. 1.500% Uses 19 tooth planet gears, a 38 tooth sun gear and a 76 tooth ring gear. necessary hardware. 1.28% Uses 32 tooth planet gear, a 25 tooth sun gear and an 89 tooth ring gear. They only serve to transfer the power of the ring gear to the planetary and to rotate around the sun gear if the sun gear is held stationary by the sprag clutch. The boat clutch provides gentle engagement and disengagement. 2 Speed + reverser with Pro output: 18.500". The gearset in the third case alone, 1.31:1, determines the third gear ratio. The Sprag clutch is utilized in each shiftable section of the LENCO with the exception of the reverse. With the extensive number of ratios we offer it is possible to choose from over 7,000 first gear combinations in the case of a four-speed for example. 1.48%Uses 22 tooth planet gears, a 40 tooth sun gear and a 83 tooth ring gear. fine tuning your available power application to specific track conditions. 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. Lenco, the all time champion and undisputed leader in the drag racing transmissions. With its modular design, an infinite number of speeds can be added. Lever or CO2 shift. One variation is that the ST1200 uses budget-friendly 8620 alloy for the gears instead of the more expensive 9310 material. Casings are anodized and set in a mechanical press. Reverse is a small black lever. Each LENCO transmission is thus a two speed and is housed in one dedicated two speed. Each sun and planet gearset provides two speeds. Lencodrive - Lenco Racing Transmissions 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. The arm is held into the servo piston by a set screw. The arm must be free to move in all directions. shift pressure control. Copyright 2020, Lenco Racing. 9. I do have three .080" shims, two .017" and six .027" shims. The planet gears are driven by an encompassrng flng gear. You can expand to 3 or 4 speeds by addition of additional cases. 1.73% Uses 14 tooth planet gears, a 76 tooth sun gear and a 104 tooth ring gear. Burnout's (on all LENCOS): As with all Lenco transmissions the ST1200 is a planetary design and comes with up to 6 forward speeds. The Lencodrive will accept virtually any manufacturer's torque converter. 1.44%Uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear. ST1200 Street Strip 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 possible combinations are endless! Going to low on the pressure you get lazy shifts and faster transmission clutch wear requiring frequent changes. 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. Since the 30 wt oil is thicker it takes a . 1.20% Uses compound 22 and 32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. Going to high on the pressure shocks the transmission and drive-train. 1.38% ratio uses 23 tooth planet gears, a 28 tooth sun gear and a 74 ytooth ring gear. Stay up to date with news and promotions by signing up for our monthlly newsletter. 1.35% Uses 26 tooth planet gears, a 28 tooth sun gear and a 80 tooth ring gear. 1.48% Uses 22 tooth planet gears, a 40 tooth sun gear and a 83 tooth ring gear. All transmissions are the sum of their parts. The LENCO ST1200 is the answer for Pro Street and street/strip applications. No further adjustments are necessary as there is ample reserve travel in the servo. Glazed, burned and chipped discs must also be replaced immediately. Air servo or max-adjust shift tower and lever. 1.68% - Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear. Different Sizes -LENCO utilizes several different styles and sizes of sprags depending on which application the transmission is used for. I use an electric over air setup to shift my new B and J transmission. The only difference is that in an automatic, the transmission fluid moves internal valves to close the clutch pack. This action compresses an internal clutch pack which results in a final driveratio of 1:1. 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. This worked for the vast majority of consumers, but it left a lot of gaps that prevented fine tuning of a combination because the spacing between the ratios was so spread out. View the whole process and start at the beginning. The Lenco Racing Lencodrive 2 Speed Automatic Transmission represents our response to people who hav.. A BorgWarner T56 six-speed transmission was used in the Viper; automatics have never been available. Reverse Lockout. 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. The downside of this setup is that the shafts are only supported on their ends, so the shaft can bend with torque. and control slippage. The Lenco Racing Lencodrive is the automatic answer for people who prefer torque converter/automatic transmission applications. Screw air servo into case until it bottoms out against the jam nut. This clearance should be between .080"-.120" and can be adjusted by adding or subtracting floaters . The sections are joined by a sprag clutch that restricts rotation of the sun gear to one direction. You always need to come out of the water box in high gear to prolong the life of the transmission. Smaller diameter and shorter length make this transmission a practical choice for use in restricted confines and instances when you have limited distance from the engine to the rear end. Multiple speeds are achieved through utilization of multiple cases. up to the CO2 configuration or vice versa. 1.368%Uses 21 tooth planet gears, a 25 tooth sun gear and an 74 tooth ring gear. Dale's Transmission on Instagram: "Weird Transmission Wednesday The The original solid steel planetary carrier was also replaced with a two-piece planetary carrier that is part steel and part aluminum. When the transmission is shifted a clutch pack compresses the rotating sun gear assembly to the direct drive central sun gear. 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. 5-Speed $10,660. Shown with our boat bellhousing. This is our double large sprag assembly and is used primarily in the boat applications, but has found its way into some car applications. To select any gear (ie 1st gear) the other two levers (3/4th & reverse) must be in the neutral (center) position. Aside from manufacturing benefits, it also gives customers a finished piece that looks more like jewelry than an automotive part. Lenco Racing Releases New Billet Street Transmission - MotorTrend Shift Patterns: All levers in forward position result in the transmission being in first gear. Multiply the two rear case gearset ratios to determine the second gear ratio of 1.80:1. 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. The middle case would also contain a 1.37 planet gear set. I shift it with a timed switch getting its signal from an electric shifter box so that it applies voltage for 17 sec at the shift. Copyright 2020, Lenco Racing. It uses a clutch and flywheel assembly only to engage the transmission into first and reverse . The Sprag clutch is utilized in each shiftable section of the LENCO with the exception of the reverse. The CS1 will control up to 3000 HP. Each case in succession, with its particular underdrive ratio, determines the immediate drive ratio. A large sprag clutch is attached on to the sun gear of the planetary carrier finishing the transmission section. These four gears (sun gear and three planet gears) sit in a planetary carrier that holds them together as a unit. What kind of clutch you run is a big factor. Both transmissions are available in 2,3, 4 or 5 speeds. 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. Lenco, the all time champion and undisputed leader in the drag racing transmissions. 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. The Lencodrive is the shortest and lightest torque converter driven transmission available anywhere. The sun gear is the center of the mechanism's universe. Remember that each separate case contains it own Copyright 2020, Lenco Racing. Air or manual shift. CS1 Standard Design - Uses 24/28 tooth planet gears, a 23 tooth sun gear and a 78 tooth ring gear. We acheive more than two speeds by combining multiple cases. Since each case contains one gearset and provides both underdrive and direct drive,multiple cases (gearsets) provide multiple underdrive ratios. 1.280%Uses 27 tooth planet gears, a 21 tooth sun gear and a 75 tooth ring gear. Other refinements are O-ring seals that replaced the the gasket seals between the transmission casings. The truck runs a big-block Chevy that makes 1,100 horsepower on pump gas and lots of nitrous oxide. Copyright 2020, Lenco Racing. 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. Tags: Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. 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. of the adjustable shift tower plunger. The main advantage of a lenco transmission is its simplicity. All ST1200 Street units now come with low drag bearings and a billet case. The tallest to the right is used to shift the transmission from first to second gear. A large ring gear surrounds the entire solar system of gears. All Rights Reserved. Typically the CS-1 and CS-3 run the 2.50" piston air servo (150 psi) and the CS-2 and Lenco drive runs the 3.00" piston (250 psi). Adjustment: For additional information about Lenco products please email us here, or call us at (909) 673-9080. 1.438%Uses 20 tooth planet gears, a 32 tooth sun gear and a 73 tooth ring gear. LENCO transmissions are shipped with the shift levers removed in order to prevent damage during shipping. But extreme cost-among other things--has always been a huge inhibitor for all but the stoutest of street-driven machinery.
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