Anyone have any info on 2 speed rear end gearing or a 2 speed tranny thats avaliable on a 99 DODGE CUMMINS ton truck ; Mines got a 5 speed but want a 10 speed , anyone have any tips, pointers or experience on this ? Thanks !!

 

gear vendors is the best way, its an aux. trans, either overdrive or underdrive, and can be computer controled or manual