So sorry, I neglected to add this info. This is a 65 Chevy C10. I am pretty sure it came with a 292. It now has a 350. It appears to have original type clutch and transmission. So I am assuming the rear ends is the original.
According to
http://www.drivetrain.com/GMtrkratio_posidata.html The truck has a "GM 8.875 12 bolts 11inches wide".
Longbox55, I did not know about the codes. I will try to find that code on the truck. Thanks.
There was a lot of helpful info in here. Thanks to you all. Hopefully, I have enough to be able to get the gear ratio.
