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Click on image for the lowdown. 
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| | | Forums66 Topics128,034 Posts1,055,541 Members48,425 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | The id number should be stamped on the front upper surface of the differential carrier to the right of the vertical rib. There should be a 2 letter code (plant and ratio) folowed by a3-4 number code (month and day built). Most likely, it will be a 5.14:1, the std ratio for a 3800.
Bill Burmeister
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