What is the best rear gear for??

[mbgmike]

Originally Posted by 68Stepbed

I don't think you can get 3.55 gears if it's a truck 12-bolt. 3.42 is the only choice, which will work well also. Do you know what kind of rearend you have? The OD tranny is a good idea if you want to spend the money. If you want to get by on a budget, put a set of 3.42's in it.

yeah no 3.55 3.42 is closest gm #12-342 for truck 12 bolt. Also it helps to know your tire diameter