Each planetary gear set is in its own housing and carries a higher ratio. Material Gears. Lenco celebrates over forty-five years of the engineering and manufacturing of the most successful drag racing transmissions ever built. Leaving the pressure plate spring (wave spring) out, place the pressure plate on top of the clutch pack. 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. Each LENCO transmission is thus a two speed and is housed in one dedicated two speed. at a lesser price than our full race units. Lencodrive 4 Speed. How is this done? 1.16% Uses 21/36 tooth planet gears, a 22 tooth sun gear and a 79 tooth ring gear. Engineered to handle 3500+ HP the Standard Design LENCO is available with up to 5 speeds and comes in a cast magnesium case. Each gear is engaged by pulling down on the shift lever, to activate the clutch mechanism for each gear set. (only on CS-1 style or center shift transmissions): Air shifted LENCOS come pre adjusted from the factory. Shift Patterns: All levers in forward position result in the transmission being in first gear. The sections are joined by a sprag clutch that restricts rotation of the sun gear to one direction. Light weight ring gears (units w/27 and 32 spline shafts only). Light weight components. Multiply all three gearset ratios to determine the first gear ratio of 2.46:1. The Lencodrive comes as a 2 speed with reverse. This unique clutch is a very popular replacement for clunky V-drive dog style in-out boxes. Going to high on the pressure shocks the transmission and drive-train. 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. 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. The ST1200 comes with aluminum cases instead of the magnesium style race units. 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. Once you have achieved the proper clearance reinstall the pressure plate spring and clutch housing snap ring it is then complete, ready for installation. necessary hardware. 1.31% Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. Lever or CO2 shift. The arm is held into the servo piston by a set screw. Multiply all three gearset ratios to determine the first gear ratio of 2.46:1. Screw air servo counter-clockwise about five or six turns before you reassemble the transmission. All levers in forward position result in the transmission being in first gear. If a sun gear to ring gear has a ratio of 1.44, then the intermediate shaft that is attached to the planetary carrier is spinning at a 1.44 reduction in relation to the input shaft. the sun gear from rotating in one direction. Screw the servo into the transmission case until contact is made with the shift fork pin. The arm is held into the servo piston by a set screw. up to the CO2 configuration or vice versa. You must multiply each case's underdrive ratio in order to determine the first gear ratio. If it is necessary to remove the servos you should reinstall with the lock nut spun completely to the top of its travel. Lenco, the all time champion and undisputed leader in the drag racing transmissions. Screw air servo into case until it bottoms out against the jam nut. All three units shifted equal final drive ratio of 1:1. 1.41% - Uses 24 tooth planet gears, a 34 tooth sun gear and a 83 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. All Lencodrives come with the following (less converter). 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. 1.73% Uses 14 tooth planet gears, a 76 tooth sun gear and a 104 tooth ring gear. 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. Once all cases have been shifted the entire transmission assembly is locked in the final 1:1 direct drive ratio. Boat Transmissions and Boat Clutches 1.31% Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear. 1.19%Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear. With a simple shift pressure adjustment you can easily compensate drag racing, I do have three .080" shims, two .017" and six .027" shims. 1.297%Uses 26 tooth planet gears, a 22 tooth sun gear and a 74 tooth ring gear. Lenco Clutch Disk Alignment Tools areavailable in black anodized billetaluminum. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. This is what comes standard in most new LENCO transmissions. 1.22% (1.219) - Uses 30/35 tooth planet gears, a 23 tooth sun gear and a 90 tooth ring gear. 1.68%Uses 15 tooth planet gears, a 62 tooth sun gear and 91 tooth ring gear. I've mounted it where It's most comfortable for me. 3/4" Gear Set. Run air servo jam nut and o-ring down against the case and tighten with a 1 1/2" wrench. There are a lot of variables. In order to achieve an underdrive first gear launch ratio the LENCO transmission relys on planet gears which rotate around the sun gear. sr1200, 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? Double Large Sprag Assembly -This is our double large sprag assembly and is used primarily in the boat applications, but has found its way into some car applications. Call the Hurst Lightning Rods, a popular sight in a mid-'80s issue of Hot Rod, a road-going take on a Lenco transmission. Apply a small amount of Red (271) Locktite on the set screw. The rear case a 1.31 ratio gearset. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . Final drive ratio is 1:1. Since all LENCO transmissions utilize the same internal gearing design you can easily change from a manual shift set 1.256% Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 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 . - Uses 28/38 tooth planet gears, a 23 tooth sun gear and a 91 tooth ring gear. A large sprag clutch is attached on to the sun gear of the planetary carrier finishing the transmission section. 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. 1. Throwout bearing collar (4 & 5-speed only). Again, in an effort to increase fuel economy, Vipers ship with tall 3.07:1 final drive ratios. It has special attachments to help it react quicker between the locked and the overrun position thus extending its service life. 300M Input/Cluster Shafts. 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. 1.38% Uses 23 tooth planet gears, a 28 tooth sun gear and an 74 tooth ring gear. We acheive more than two speeds by combining multiple cases. You always need to come out of the water box in high gear to prolong the life of the transmission. Posted 6 days ago. 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. It might be less, it might be much more. On the street five-speed model the ratios start at 3.25 in first gear, 2.26 in second, 1.64 in third, 1.25 in fourth, and fifth gear is 1:1. Do Not Over Tighten. Shown with our boat bellhousing. 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. 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. Stay up to date with news and promotions by signing up for our monthlly newsletter. With a selection of 16 first-gear ratios for the two-speed and hundreds more for three-speeds the LENCODRIVE presents you with the opportunity to dial-in your exact combination. In order to achieve an underdrive first gear launch ratio the LENCO transmission relies on planet gears which rotate around the sun gear. 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 4-speed above shows how to determine drive ratios. Large Strips and Clips Sprag Assembly - Thisis a specialized sprag and is used in applications where tire shake is a constant problem. You can expand to 3 or 4 speeds by addition of additional cases. The second lever, and second tallest, is used for third gear. Lenco Transmissions utilize several different styles of clutch discs and depending of which style lenco you have you will also find different clutch counts in each case. All levers in forward position result in the transmission being in first gear. Lencodrive 3 Speed. As with all Lenco transmissions the ST1200 is a planetary design and comes with up to 6 forward speeds. As with all Lenco transmissions the ST1200 is a planetary design and comes with up to 6 forward speeds. The Lenco is basically a planetary transmission where each gear has its own housing and its own shift lever. The ST1200 allows Jeff to control how hard his transmission shifts by changing how fast he pulls on the levers. The CS2 ,CS3, and CS4 LENCO racing transmission is a smaller, lighter and more compact version of our CS1 Standard Design. Each case in succession, with its particular underdrive ratio, determines the immediate drive ratio. The tallest to the right is used to shift the transmission from first to second gear. the final shift, being locked to a 1:1 ratio. Do Not Over Tighten. 1.21%Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear. 8620 is a premium quality material that will provide excellent service for 1200 HP hot rods. Think of it as manually shifting an automatic transmission. In general, all LENCO transmissions are a planetary design. Once all cases have been shifted the entire transmission assembly is locked in the final 1:1 direct drive ratio. Three planetary gears rotate around the sun gear like planets traveling in their orbit. The rear axle is a Dana 44 with independent half-shafts. The LENCO ST1200 is the answer for Pro Street and street/strip applications. Enough to make the run and turnoff before it releases. The planet gears are driven by an encompassing 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 LENCO gear reduction unit - with a range of 31% to 56%-helps get you off the starting line. Remove fill plug on top the transmission case you are going to adjust. 1.46% - Uses 22 tooth planet gears, a 37 tooth sun gear and a 80 tooth ring gear. 1.68% Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear. . If you want to go straight to the action, skip to around 2:20. The gearset in the third case alone, 1.31:1, determines the third gear ratio. In the example of a four speed, the case nearest the engine would We do offer different thickness floaters for correcting the clutch pack clearance. 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. Due to the way they are designed and operate, the advantages are clear. The original ST1200 came with a cast aluminum case, gasket seals, and a range of selectable gear ratios. It's capacity is much stronger than the small sprag. 3 Speed with single brg and std output: 23.375". By multiplying these three ratios you come up with a 2.46 first gear ratio. gearset/ratio and when connected to additional cases multiple ratios are realized. For 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. The rear case a 1.31 ratio gearset. Thus a 1:1 ratio is achieved. LENCO transmissions are a planetary design. 1.50% Uses 22 tooth planet gears, a 44 tooth sun gear and an 88 tooth ring gear.

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