Originally Posted by or8ital
Whats the best way to break in the diff? Ive heard running it on a dremel. For how long and what other steps?
I will usually install the diff in the car. Set diff to slip just barely. Run the motor at a very low speed or 1 volt power to the motor and apply some resistance to either tire connected to the diff you want to break in. Apply some resistance to each tire. Check diff for tightness again and repeat the process. It shouldnt take more that 2 min to break the diff in. This process will prevent you from overtaxing a new diff and seat the diff parts without extra strain.