I travelled to rural Southwest Virginia this past weekend to pick up a sleeper I need for a future project. The gentleman selling it ended up have a pretty extensive collection of old Mack parts and some trucks. He was in business from the 60s up until 1998 and saved everything. He has trailers full of parts. Lots of differentials and carriers, transmissions, engines, etc. I also saw several camelback complete cutoffs laying around. As far as trucks he has two complete mid 80s R model tractors a