I ordered a Fabtech add a leaf kit for my sonoma to stop it from sagging so much with a loaded bed and the new kit doesnt come with u bolts. The stock ones have maybe a inch of thread left sticking out, probably less. Do I need longer ones and if so can I just buy them at a auto parts store or should I look for some better ones online?
Stealth Conversions U-bolts have the correct dimensions for use with the S-10 axle, whereas most aftermarket lowering kits are designed for a 3" axle. Also, most aftermarket U-bolts use 1/2" threads, which are weaker than stock U-bolts and often strip with repeated use.
I always use the old bolts as they are better quality. 8.5" axles use the same tubes as the 7.5" axles. It only swells up the tube at the differential housing.