Hi,
What a great website here. I have been reading and learning all about trucks here for a couple years and finally signed up today.
I recently purchased a 1964 C-20 to fix up for a daily driver and found a couple thing I need to find out about. I would really appreciate any help you guys can give me.

First is the rear end.
I know it has been changed because the rear wheels only have 5 lugs and I can see where there have been welded mounts removed from the top of the axle tubes.
It is a 10 bolt differential, here is what I find on it.
BR3 G026 2 on the passenger side axle tube
14055251 on the housing
A 204 on the housing
GM 31 on the housing
It seems to be kind of high geared with the TH 350 transmission.
Thanks in advance, I will try to contribute to the forums as much as I can. Bruce: Las Vegas, Nevada.