Quality Differential Parts since 1982!
GM RPO Codes, or General Motors “Regular Production Option” codes contain lots of valuable information about your GM vehicle. Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box. (Accurate identification using the GM RPO code assumes that the rear end has not been previously modified) The prefix is usually F, G or H when referring to Axle Identification. The list below is a partial list of typical GM RPO Codes, specifically the codes pertaining to Axle Identification, Differential Type and Gear Ratio.
Does it have a drop out third member AND removable cover? If so, it’s probably an HO72/HO52……We have a limited supply of parts for these, basically master and bearing kits, a few other misc. and used parts. Please call our parts specialists for assistance. (800) 510-0950
I have a 1970 c20 pickup truck can only find the cast #3934635 and a 0 under it and a 2 under the 0can u help
We usually can’t determine much from casting numbers and such. In this case, a Google search using the casting # provided some info. Our sales department sent a reply directly to your email.
I have a chevy rear that was put into a 57 chevy , from another chevy.
I am trying to find out what it is here are the #
date code is 7 C 29
# on Pass side facing front on the tube PHC 7108 1
Can you send me info to my email ?
Humans, show your math skills: *Time limit is exhausted. Please reload CAPTCHA.
Ring & Pinion Gears
Installation / Repair Kits
Replacement Axle Shafts