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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: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | It is true that Chevrolet did not use a rear seal until 1940.
That said I would start by pulling the pan and checking main bearing clearances. If the rear main has too much clearance it can leak oil pressure/oil out faster than it can drain back into the pan. I would also make sure the drain back hole is not sludged up.
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