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Click on image for the lowdown. 
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| | | Forums66 Topics128,076 Posts1,055,920 Members48,429 | | 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: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | From my experience overfilling can be a problem in diesel crankcases but not so much in differentials. I was always taught to fill until your little finger could feel the fluid through the fill hole. However with those a top fill hole I don't know.
~Jim
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