im possibly doing a new ring and pinion also as i want to have 3.08 gears in it. he said he needed that info in order to rebuild my rear end. he has rebuilt 2 gm 10 bolts and seems to know what he's doing. as far as the chassis service manual goes, would that info be in the shop manual? i have one laying around somewhere for my truck. thanks for the info though hotrod. any other advice you have please feel free to share.