I have a d 30 front and 8.25 rear. I had installed a Spartan "lunchbox" locker in the rear 2 years ago. I decided a gear upgrade was due... and while I was in there started looking at front locker options. I called a catalog outfit... got a package deal, new carriers, trutrac for the front.. install kits 1100.00 if I remember correctly. The problem was, the carrier bolt wouldn't install with the thicker ring gear. Noone had a solution. A larger rear carrier is not made for a 8.25.. Randy's had the solution to shave two teeth on the ring gear.