Eaton Detroit TrueTrac Differential (8.8" Ford, various splines)
Matt's Notes: These are the go-to differentials we run on all of our quick street cars/trucks with the 8.8" Ford rear ends. They'll take quite a bit of abuse compared to the stock Ford differentials and have better street manners than lockers or spools. If you're not in spool territory in terms of power output, these will probably get it done for you.
These Eaton Detroit Truetrac differentials use a patented design of parallel-axis planetary helix gears to provide a quiet, automatic splitting of torque. They perform like a limited slip differential under normal driving conditions, automatically transferring torque to the wheel with better traction when ground conditions warrant.