I've pushed snow for a lot of years, and drug car trailers around for even more years on the standard mid 70s Dodge transfer case equipped trucks, many went well over 100,000 miles, a couple over 200,000 miles, without a single transfer case issue. In fact, none were ever taken apart. The only one I ever had that ever had any damage was the one where the transfer case got busted in a crash that totaled the truck.

I think a freshening up will be all it would ever need. Gene