The JEFFco Performance has more than proven itself on the track and for street use.

The 3-speeds are being used in high horse-powered cars with great success...

The 4-speeds are King at many events. Tom Hargar won the Ozark Super Shifters Championship and won the Lenco Challenge Race with a JEFFco equipped car.

The Reverse Differential is working well to 400 HP we have made big changes to our differentials to please our customers.

Those are at 450 HP and MORE! A Spool is in the works!