I was a Baker dealer since 1972. The Borg Warner transmissions were bullet proof. We only rebuilt one, ever. Most of the wear items for this truck are still available. The one item that is not available which would be a big issue is the drive wheel hubs. Most people that worked on these trucks didn't tighten the drive axle nut enough and the key on the axle shaft would be loose causing the key way in the hub to wear and/or crack the hub.
These trucks were available in two series, one with 1882 in the serial # and the other had 1911 in it. The 1911 was a much better truck.