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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!
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| | | | Joined: Feb 2017 Posts: 4 New Guy | | New Guy Joined: Feb 2017 Posts: 4 | Thanks for the answers!
After further cleaning and inspection of the cap it seems it had a hex shape (could've been 5/8" size) and the embossed letters I hardly could read say "USE EIS HEAVY DUTY FLUID" and "EIS W944".
So it seems it is a different cap as on your trucks!?
Thread diameter is 1 9/16".
Seems I should try to restore it to the original hex shape...
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