picked up a '77 power wagon. has 4 spd that syncros toast and main shaft shot. tranny hard to find here. what other tranny can i swap?

 

Have you checked into how much a rebuild would cost? When I bought a '93 Ranger I found that the tranny was shot in it too. I replaced the flywheel, slave cylinder, tranny mount, 2 of the 3 cluster gears/shafts, all synchros, and put a bearing kit in it. Got the internal parts off of eBay and the rest from Autozone. Had less than $550 in it. The clutch on mine was brand new when I tore it apart.

Derek