i run a truc trac in my car.

71 Challenger 727 408 small block,

i have had it in the car for 3 years right now with no problems.

My tires i am running are mickey thomas et street radials 275/50/15 with SuperStock springs. Plenty of hard lunches on them.

however this is a street car and never been to the track. Also if you are running stock style axle bearing you will need to order a trust spacer as the unit doesn't come with it.

If you have "green bearing" then you don't need the spacer, also you don't need the limited slip additive.