OK, I'm running a BBC in an '87K5 orig equip w/ SBC. The PO had shimmed the transfer case down for vib - I've raised it back up and now the fan contacts the lower shroud. Presumably the mount assemblies are from a 2wd application and thus are sitting low. I'm going to check the clamshells this evening to see if they are OK or worn. Seems like there are numerous threads on the subject. 4wd mounts do not seem easy to find. Q: is it possible to shim the motor mounts up on the frame side or otherwise correct the mounting location?