I recently bought a 1971 (decoded) Ford C6 Truck Transmission out of a wrecking yard. I know nothing about the truck it came out of. I'm an amateur transmission rebuilder with better than average tools and experience. I also have good manuals. Anyway, the transmission is pretty dirty on the outside, so I assumed it needed a rebuild. Before I took out the main pump, I checked the end play and it was .030, well within range. This transmission looks like new on the inside. The band looks like it was just installed, the inside is totally clean, the fluid is perfect and the seal on the main pump feels like new. I haven't gotten into the clutches yet. Considering the age of the transmission, I can only assume it's been rebuilt at least once. I've gone this far and am wondering if I should go through it or button it back up as is?

For sleep insurance why not go through it?

Makes sense to me. I've gone this far and a kit is not that expensive anyway.