I put a pair on my 73 Dart Sport 340.My motor is stroked to a 372(dynoed 452hp)I also have centerforce dual friction clutch with Lakewood scattershield,8 3/4 with 4.10 and strange axels.I race my car at the track and put the slide-a-link on for traction help(running slicks also)I,m still learning to Launch my car as it,s a 4 gear.I guess I,m kinda a scarety cat when it comes to launching.Last year I broke an axel in the factory 8 1/4 and the wheel and axel passed me.Everybody has their own opinion about them,good and bad.I,m very pleased with the traction I have and they are adjustable.Sorry for being long winded,but people will try to talk you out of them.Do you plan on racing your car?A pinion snubber will work fine for a car under 400 hp with ss leafs.