Reference: C15 s/n 2842129988 history and restoration

[Alex Blair (RIP)]

Originally posted by rampant rivet
Bob Ive just checked for stampings on the diff and they are 637 Y 765
Craig I have attached some pics of master cylinder and bracket I hope that they are of some use.

Hi Ramp...
Sorry,I don't know if you have another name..but yer mum had a sense of humour if Rampant Rivet is your real name,but anyway ,name or no name you are doing a great job on the truck..The 637 in the number refers to the gear ratio..the C15's had the 6.37:1 rear ends and the C15A had the 6.39:1 rear ends..diffs,if you prefer..

The first C8A,C8AX also had the 6.37:1 diffs... but changed down to 7.38:1...on replacement...