[tucsonjwt]

If you can find a good local differential shop ask them for some advice. I am pretty sure that the floating axle seals cover most years, but if you can find an application chart online that would tell you, or call your Chevy dealer and ask him what model years that new GM axle seal part number applies to. You can put your calipers on the axle shaft in the two step locations to verify that the new part number will fit your axle. The shoes and drums are described by size on the AC/Delco websites, and probably on Rock Auto's website also. The wheel cylinders have a size description also, as I recall. I think you could put C35 or C3500 (or K if 4WD) in the search box on parts websites and use different model years to get verification of part numbers - I would start at 73 and end at something like 99. Doesn't the rear axle have some numbers on it that indicate model of rear axle? My guess would be that those floating axles have not changed much, but I know a differential guy could verify that for sure. Also, I recall seeing differential specialty dealers online with a lot of information and contact information for technical help, if you don't have a friendly local differential shop.