They say it’s the strongest, toughest gearbox ever –and they could be right

ig power is the name of the game these days. 120-plus cubic inch engines are putting out double the horsepower and torque of a stock Harley motor. Couple that power with one of those gigantic rear tires everyone’s using and the super-positive clutch that’s become part of the picture and the loads on the transmission skyrocket. They’re soaring way past what anyone ever expected a motorcycle transmission to have to deal with.
      Anyone but JIMS, that is. If you’re looking for a super-strong transmission–or a transmission retrofit kit–here it is. The Fat 5 Overdrive, just introduced, just might be the strongest, toughest gearbox ever made. By taking advantage of its new and more compact shifter technology, JIMS was able to increase the width and strength of every gear inside the transmission. The width increases vary from 18- to 53-percent, the percentage of increase depending on the loads each gear set must carry. The Fat 5, with its .886 overdriven 5th, is offered as a complete transmission or as a FatGear Super Kit that can be installed into an existing transmission case.
     The Fat 5 transmission and FatGear Super Kit fit both Evo and Twin Cam chassis. With an explanation. Both the complete transmission and the Super Kit use a new trapdoor design that’s .870-in. wider than stock, so these transmissions and Super Kits aren’t exactly a straight bolt-for-bolt drop-in replacement. Modifications to the exhaust brackets, for instance, will become necessary. For that reason JIMS has positioned the Fat 5 and the FatGear Super Kit as “custom application” parts.
     Fair enough. Moving some brackets around, and maybe an oil spout, isn’t much of a price to pay for a set of transmission gears matched to the power of a mega-motor and the bite of a mega-rear tire. In the power crazy V-twin world of today an ultra-strong transmission has been the missing link. It isn’t missing any more. The JIMS Fat 5 and FatGear Super Kits are here, and Drag Specialties has them. Call your rep today.