Help finding differential gear ratio
- Thread starter GDUP409!
- Start date
On the passenger side of the rear end housing ( opposite the number & letters you posted) there are stamped letters and numbers stamped into the metal face - they are hard to read without cleaning the housing with a wire brush and maybe some grease cleaner or metal cleaner.
take picture or post the numbers and letters - there is a table on this site showing the codes with the factory gear ratios tied the stamped letters and numbers.
Paul
take picture or post the numbers and letters - there is a table on this site showing the codes with the factory gear ratios tied the stamped letters and numbers.
Paul
GDUP409!
Member
Hi Paul. I cleaned the other (passenger) side rigorously with brake cleaner and a wire brush, and i didn’t see any markings. When you say metal face, is that toward the front of the unit or the rear where the filler plug is located? . I’ll give it another try. I’ll let you know what i find. Thanks so much for responding.
here is the rear end ratio chart from this site - it only has the letter(s) part of the stamped codes
1958-1970 Full size rear Differential Identification
1958-1970 Full size Chevy rear differential identification chart.
www.348-409.com
Here is our chart and where to find the code. Being stamped, it can be quite faint and hard to see. 
1958-1970 Full size rear Differential Identification
1958-1970 Full size Chevy rear differential identification chart.
www.348-409.com