1.25% ratio uses 32 tooth planet gears, a 22 tooth sun gear and an 86 thooth ring gear. Material Gears. 1 position forward selects 1st gear, then 2nd gear is selected by . 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. 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. Air or manual shift. Apply a small amount of Red (271) Locktite on the set screw. What does this mean, you wonder? You may choose any conventional input shaft spline. The main advantage of a lenco transmission is its simplicity. 1.46%Uses 22 tooth planet gears, a 37 tooth sun gear and an 80 tooth ring gear. Three planetary gears rotate around the sun gear like planets traveling in their orbit. Multiple speed transmissions use multiplication of gears to create different speeds. Final drive ratio is 1:1. (2) it is easier to work on the bruno/lenco . 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). 1.566% Uses 18 tooth planet gears, a 45 tooth sun gear and an 81 tooth ring gear. Street and Drag Racing Transmissions - Engine Builder Magazine Each LENCO transmission is thus a two speed and is housed in one dedicated two speed. Sight through plug hole, where you will see the outer edge of the rotary shift plate. The original ST1200 came with a cast aluminum case, gasket seals, and a range of selectable gear ratios. Large low drag bearings, that the planetary gears will float on, are pressed into the casings. 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. Lenco downshifting - YouTube Second gear ratio is 1.80 and third gear is a 1.31 ratio. The planet gears are driven by an encompassrng flng gear. Most often seen in supercharged alcohol and mega HP nitrous cars the CS1 Standard Design LENCO is also commonly used by Pro Mod machines and blown nitro and alcohol drag boats. The gearset in the third case alone, 1.31:1, determines the third gear ratio. 1.22%Uses 21/30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear. Now rotate counter clockwise 1/2 to 1 turn and tighten lock nut. This clearance should be between .080"-.120" and can be adjusted by adding or subtracting floaters . When this same section is shifted the Sprag then allows the sun gear to rotate in the same direction as the. Air shifted LENCOS come pre adjusted from the factory. Lencodrive 2 Speed. When this same section is shifted the Sprag then allows the sun gear to rotate in the same direction as thecrankshaft. By multiplying these three ratios you come up with a 2.46 first gear ratio. automatic, 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. Multiple speeds are achieved through utilization of multiple cases. 3 Speed + reverser with Std output: 24.000". Lenco, the all time champion and undisputed leader in the drag racing transmissions. RATIO CHART The arm is held into the servo piston by a set screw. Pistol Grip Manual Shifter. 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. Jeff says that he loves the transmission and "the only thing different [from driving a traditional gearbox] is that there is no engine braking". Shims before and after the shifter plate assembly -. Lenco, the all time champion and undisputed leader in the drag racing transmissions. The ST1200 gives you the advantage of Lenco brute strengthat a lesser price than our full race units. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio. 1.44% - Uses 20 tooth planet gears, a 32 tooth sun gear and a 73 tooth ring gear. This is an in-car shot video of Mike drag. Each case in succession, with its particular underdrive ratio, determines the immediate drive ratio. This unique clutch is a very popular replacement for clunky V-drive dog style in-out boxes. Each LENCO transmission is thus a two-speed and is housed in its single dedicated case. 1.25% ratio uses 32 tooth planet gears, a 22 tooth sun gear and an 86 thooth ring gear.

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