The '87 C20 probably has 8-lug hubs.

The '74 C10 should be 5-lug hubs.

And if its stock, the '64 should have 6-lug hubs.

I've not performed the swap, but I understand its about what you've heard elsewhere.


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...