| GM Duramax diff parts, axles, Diff Covers, E-lockers & 3.42 Gears! We now have 3.42 gears for Duramax trucks! Previously unavailable for the 11.5 AAM rear axle. Now you can improve your fuel economy by simply changing the gear ratio in your rearend! Call or email for more info! We are also stocking E-locker units for the front differential, and HD LSD posi units for the rear axle! give us a call! |