You want strong? We have strong! JIMS “Fat 5™ Overdrive” is simply the strongest, toughest gearbox made. Period. JIMS took advantage o...
You want strong? We have strong! JIMS “Fat 5™ Overdrive” is simply the strongest, toughest gearbox made. Period. JIMS took advantage of its, more compact shifter technology to increase the width and strength of every gear. The width increase varies from 18% to 53%, depending upon the loads each gear set must carry. Big Power is more popular than ever. Large engines like the JIMS® 120”, 131” & 135” deliver double the stock power and torque. When such power is linked to the ground through high torque clutches and big sticky tires, the peak loads on transmission gears rise far above what anyone but JIMS ever expected their trannies to have to endure.
Fat Gear Superkits are shipped as a gear cluster installed into a trap door. All necessary shifting components, gaskets and unique components are supplied to be installed into an existing transmission case. See Additional Information for fitment.
- Gear cluster is installed into a unique chrome trap door
- Designed to slip into stock transmission case
- .886:1 "overdrive" 5th gear
- Compact shifter technology increases width and strength of every gear
- Width increase varies from 18% to 53% depending upon the loads each gear set must carry
- Made in the U.S.A.
NOTE: The Fat Gear transmissions incorporate a unique trapdoor and a mechanical cable type side cover design that extends approximately .560” from a stock side cover. For this reason, certain modifications may be necessary to the exhaust bracket and or FL’s oil filler spout to properly install a Fat Gear transmission. For this reason, this is a custom application only.