ok... i have a basically stock 1985 TPI Z28 and i get ZERO traction i spin all the way up to 2nd gear (i have to be grandma not to spin em) i think most of this wheel spin is due to the lack of posi and the tiny 215 good year eagles i got on there. Well i have the posi ready to go in now im just woundering how drastic of a differnce i will see. i dont want to get bigger tires yet as these still have some life in them. next year i will probably get some BFG radial TA 235s.