HowaLENCOworksMASTER

We offer an extensive variety of transmissions.The following text presents a brief description of each of our designs. For more specific information on any of these transmissions please refer to the pages devoted to the style you are interested in or call our TOLL FREE tech line at 1-800-854-2944 (619/297-2500 in California) or email at:

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 case.

We achieve 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 cases (gearsets) provide multiple underdrive ratios.

You must multiply each case’s underdrive ratio in order to determine the first gear ratio. In the example of a four speed, the case nearest the engine would contain a 1.37 ratio planet gear set. The middle case would also contain a 1.37 planet gear set. The rear case a 1.31 ratio gearset.

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.

You will need to add a LENCO reverse unit in order to back up.

The 4 speed at right shows

how to determine drive ratios.

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 it’s 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 engine’s clutch fully engaged.

Call our technical department at 1-800-854-2944 (1-619-287-2500 in California) with any questions you may have concerning function or applications. Or click to email:

1.25% Uses 34 tooth planet gears, a 23 tooth sun gear

and a 91 tooth ring gear.

1.28% Uses 32 tooth planet gears, a 25 tooth sun gear

and a 89 tooth ring gear.

1.31% Uses 27 tooth planet gears, a 25 tooth sun gear

and a 80 tooth ring gear.

1.34% Uses 24 tooth planet gears, a 25 tooth sun gear

and a 74 tooth ring gear.

1.37% Uses 27 tooth planet gears, a 31 tooth sun gear

and a 83 tooth ring gear.

1.41% Uses 24 tooth planet gears, a 34 tooth sun gear

and a 83 tooth ring gear.

1.44% Uses 20 tooth planet gears, a 32 tooth sun gear

and a 73 tooth ring gear.

1.44% Uses 22 tooth planet gears, a 35 tooth sun gear

and a 79 tooth ring gear.

1.46% Uses 22 tooth planet gears, a 37 tooth sun gear

and a 80 tooth ring gear.

1.48% Uses 22 tooth planet gears, a 40 tooth sun gear

and an 83 tooth ring gear.

1.50% Uses 17 tooth planet gears, a 34 tooth sun gear

and a 68 tooth ring gear.

1.56% Uses 16 tooth planet gears, a 41 tooth sun gear

and a 73 tooth ring gear.

1.68% Uses 15 tooth planet gears, a 62 tooth sun gear

and a 91 tooth ring gear.

1.16% Uses 21/39 tooth planet gears, a 22 tooth sun gear and a 79 tooth ring gear.

1.19% Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear.

1.20% Uses 22/32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear.

1.21% Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear.

1.22% Uses 21/30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear.

1.23% Uses 21/30 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear.

1.24% Uses 26/31 tooth planet gears, a 23 tooth sun gear and an 80 tooth ring gear.

1.20% Uses 40 tooth planet gears, a 21 tooth sun gear and a 102 tooth ring gear.

1.22% Uses 38 tooth planet gears, a 22 tooth sun gear and a 98 tooth ring gear.

1.25% (Small shaft gearset) Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear.

1.25% (Large shaft gearset) Uses 36 tooth planet gears, a 25 tooth sun gear and a 98 tooth ring gear.

1.28% Uses 32 tooth planet gears, a 25 tooth sun gear and a 89 tooth ring gear.

1.31% Uses 27 tooth planet gears, a 25 tooth sun gear and a 80 tooth ring gear.

1.35% Uses 26 tooth planet gears, a 28 tooth sun gear and an 80 tooth ring gear.

1.38% Uses 23 tooth planet gears, a 28 tooth sun gear and a 74 tooth ring gear.

1.41% Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 tooth ring gear.

1.44% Uses 22 tooth planet gears, a 35 tooth sun gear and a 79 tooth ring gear.

1.46% Uses 22 tooth planet gears, a 37 tooth sun gear and an 80 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 91 tooth ring gear.

1.73% Uses 14 tooth planet gears, a 76 tooth sun gear and 104 tooth ring gear.

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.

1.16% Uses 21/39 tooth planet gears, a 22 tooth sun gear and a 79 tooth ring gear.

1.19% Uses 21/33 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear.

1.20% Uses 22/32 tooth planet gears, a 22 tooth sun gear and a 76 tooth ring gear.

1.21% Uses 21/31 tooth planet gears, a 24 tooth sun gear and a 76 tooth ring gear.

1.22% Uses 21/30 tooth planet gears, a 24 tooth sun gear and a 75 tooth ring gear.

1.23% Uses 21/30 tooth planet gears, a 25 tooth sun gear and a 76 tooth ring gear.

1.24% Uses 26/31 tooth planet gears, a 23 tooth sun gear and an 80 tooth ring gear.

1.256% Uses 32 tooth planet gears, a 22 tooth sun gear and a 86 tooth ring gear.

1.280% Uses 27 tooth planet gears, a 21 tooth sun gear and a 75 tooth ring gear.

1.297% Uses 26 tooth planet gears, a 22 tooth sun gear and a 74 tooth ring gear.

1.313% Uses 27 tooth planet gears, a 25 tooth sun gear and an 80 tooth ring gear.

1.338% Uses 24 tooth planet gears, a 25 tooth sun gear and a 74 tooth ring gear.

1.356% Uses 23 tooth planet gears, a 26 tooth sun gear and a 73 tooth ring gear.

1.368% Uses 21 tooth planet gears, a 25 tooth sun gear and an 74 tooth ring gear.

1.378% Uses 23 tooth planet gears, a 28 tooth sun gear and a 74 tooth ring gear.

1.405% Uses 23 tooth planet gears, a 32 tooth sun gear and an 79 tooth ring gear.

1.438% Uses 20 tooth planet gears, a 32 tooth sun gear and a 73 tooth ring gear.

1.479% Uses 19 tooth planet gears, a 35 tooth sun gear and an 73 tooth ring gear.

1.500% Uses 19 tooth planet gears, a 38 tooth sun gear and a 76 tooth ring gear.

1.566% Uses 18 tooth planet gears, a 45 tooth sun gear and an 81 tooth ring gear.