I think the TH475 was used in 1-ton trucks, but am not aware that it was ever used in anything heavier.

I have a P30 (1-ton truck) with a 12,300 pound GVW that has one. I don't know the rating of your C-60. Is it much more than that?

If you use this truck to capacity I'd want to do a little more research before assuming the transmission will last long in a bigger truck. If all its going to move around is the truck itself I bet you'll be fine.

But I'm just guessing I don't really know...

1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...