I think the Lock-right is definitely the most bang for the buck when it comes to a front locker. I've been running one in my 60 with 38" TSL's for years now with no issues, including breaking two 30-spline stubs and one necked-down inner shaft (all at different times). A friend of mine also ran a Lock-right in a 60 under a 7,000 lb. bigblock Ford with 38's for several years with no problems......though he did strip it out after going to 42" TSL's.