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Click on image for the lowdown. 
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| | | Forums66 Topics128,047 Posts1,055,532 Members48,424 | | 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!
| | THANKS!
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: Oct 2018 Posts: 118 'Bolter | | 'Bolter Joined: Oct 2018 Posts: 118 | Hi Jerry,
Yes GMC has a flange that is much larger than the diameter at the oil seal. It is approximately 5" in diameter.
Best Regards...
Bob | | |
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