I have an 06 'Bu SS 3.9l with the 4t65 trans. it has the 3.69 gearing in it, and i am going to a 3.41(swapping in the 3.05 diff) just to see what happens. I shouldnt have to change the sprocket ratio, but would i have to change the drive ratio from a 3.69 to a 3.41. it is going to use the same 30 tooth wheel that is on the 3.29 diff.