Originally Posted by Wildcat1971

So let me get this straight. When you tighten the rear slipper nut, the rear tranny locks up? I assume the front is fine? If i had to guess, I would say you somehow missed something when you built the kit. A bushing or shim somewhere around the slipper plates and shaft is causing the bind. Try pulling off the rear tranny and leave the slipper attached. Remove the belt. Try to spin the spur gear and see if it binds. If it does, leave the slipper attached and take apart the rear diff case and remove the diff. Try to spin it again. if it still binds, remove the middle gear and try to spin, if it still binds, you will know for sure it is the shaft and slipper assembly that is wrong. The inside sliper plate should not be rubbing against anything but the slipper pad. If your missing a part, it might be binding on the case or the motor plate. Just systematically slows disassemble the rear tranny until you find the binding peace.