I have a newly built Buick non C clip rearend for my car and it has all new parts including Moser 30 spline axles,Eaton 30 spline posi,Yukon 3.90 gears and new bearings. I had a great rearend builder do mine up and he has some rears in extremely fast cars. I believe the Ford 9 inch is strong,but you do lose a percentage of hp with them.I have seen too many C clip rears lose axles when left stock. Clip eliminators will take care of that. I suggest like the others to have at least good axles and eliminators as well as a good posi.I like the Buico,Olds,Pontiac rears as they have bolt in axles too.