Lencodrive 4 Speed and Reverse
For more specific information on any of these Lenco transmissions please refer to the Tabs below, or call our tech line (909) 673-9080.
The Lenco Racing Lencodrive 4 Speed Automatic Transmission represents our response to people who have asked for a safe and affordable torque converter driven transmission.
The Lencodrive is pure Lenco through-and-through with the same gearset components as our CS2. The Lencodrive is available with your choice of all popular bellhousing patterns as well as any starter pocket positioning. The Lencodrive will accept virtually any manufacturer's torque converter. We offer Turbo 400, C6, Mega (1 1/4" X 29 spline) and standard Powerglide size input shafts per your requirements.
The Lencodrive's trans-brake is controlled by an electric solenoid which activates hydraulic compression of a dedicated clutch pack. Additionally, the Lencodrive's main valve body is machined from billet components and is not the typically modified OEM Detroit component.
The Lencodrive is the shortest and lightest torque converter driven transmission available anywhere. The Lencodrive comes as a 2 speed with reverse. You can expand to 3 or 4 speeds by addition of additional cases. The 2 speed, including reverse, bellhousing and lining weighs approximately 108 lbs. The three speed is approximately 135 lbs. All cases are magnesium.
The Lencodrive does not require a containment blanket unless you use a supercharger or alternative fuels.
The v is the shortest and lightest torque converter driven transmission available.
2 Speed + reverser with Pro output: 18.500".
2 Speed + reverser with Std output: 17.500".
2 Speed with single brg and std output: 16.875".
3 Speed + reverser with Pro output: 25.000".
3 Speed + reverser with Std output: 24.000".
3 Speed with single brg and std output: 23.375".
Add bellhousing depth to above lengths for total length: Lenco aluminum, Titanium or Browell steel: 7.200".
|2 Speed Lencodrive||3 Speed Lencodrive|
All Lencodrives come with the following (less converter).
Air servo or max-adjust shift tower and lever.
Choice of output shaft length and spline.
Lencodrive Ratio - Gears 3/4"
1.20% Uses compound 22 and 32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear.
1.22% Uses compound 21 and 30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear.
1.25% Uses compound 25 and 29 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear.
1.28% Uses 32 tooth planet gear, a 25 tooth sun gear and an 89 tooth ring gear.
1.31% Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear.
1.35% Uses 26 tooth planet gears, a 28 tooth sun gear and a 80 tooth ring gear.
1.38% Uses 23 tooth planet gears, a 28 tooth sun gear and an 74 tooth ring gear.
1.41% Uses 23 tooth planet gears, a 32 tooth sun gear and a 79 tooth ring gear.
1.44% Uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear.
1.48% Uses 22 tooth planet gears, a 40 tooth sun gear and a 83 tooth ring gear.
1.50% Uses 22 tooth planet gears, a 44 tooth sun gear and an 88 tooth ring gear.
1.56% Uses 22 tooth planet gears, a 55 tooth sun gear and a 98 tooth ring gear.
1.68% Uses 15 tooth planet gears, a 62 tooth sun gear and a 91 tooth ring gear.
1.73% Uses 14 tooth planet gears, a 76 tooth sun gear and a 104 tooth ring gear.
In general, all LENCO transmissions are a planetary design. Planetary transmissions rely on a central sun gear to provide a 1:1 direct drive ratio once shifted from the launch ratio.
In order to achieve an underdrive first gear launch ratio the LENCO transmission relys on planet gears which rotate around the sun gear.
Each sun and planet gearset provides two speeds. Those two speeds are (1) the lower underdrive ratio and (2) the direct 1:1 final lock-up drive ratio.
Each LENCO transmission is thus a two speed and is housed in one dedicated two speed.
We acheive more than two speeds by combining multiple cases.
|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.
Since each case contains one gearset and provides both underdrive and direct drive, multiple cases (gearsets) provide multiple underdrive ratios.
You must multiply each cases underdrive ratio in order to determine the first gear ratio.
By multiplying these three ratios you come up with a 2.46 first gear ratio. Second gear ratio is 1.80 and third gear is a 1.31 ratio. Final drive ratio is 1:1.
Multiply all three gearset ratios to determine the first gear ratio of 2.46:1. 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. All three units shifted equal final drive ratio of 1:1.
The internal action of a LENCO is such that when the transmission is in first gear the dedicated planet gear assembly provides the launch ratio. The planet gears are driven by an encompassing ring gear.
When the transmission is shifted a clutch pack compresses the rotating sun gear assembly to the direct drive central sun gear. Thus a 1:1 ratio is achieved.
Each case in succession, with its particular underdrive ratio, determines the immediate drive ratio.
Once all cases have been shifted the entire transmission assembly is locked in the final 1:1 direct drive ratio.
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.