Thanks for the info crenwelge. First (only) helpful information I've gotten on these numbers. Can I ask where you found decoding info? I've looked all over. Well obviously not all over.
I want to change the ring and pinion from 3.90 to 3.08. I haven't seen anything lower than 3.38. That'll be ok.
Guess I've got to get it apart to see what's in it.
I'll also look into getting the maintenance manual.
Thanks again
Jim


Jim

1955 Chevy series 2
6 cylinder, 3 on the tree
Short bed, step side