ive been given a diff of a sierra. 1 turn of the drive gives 4 at the shafts. do you no what sierra this was off and what ratio
thanks adam

its probably a 3.92.
1.8 cvh used them and probably quite a few others

Yep will be a 3.92. Probably one of the most common ratios. I have 2 at home by pure chance, one from a DOHC and one from a pinto.