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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 | 1937 was the last year for a carbon throwout bearing. With that setup there was no snout on the front bearing retainer for the ball bearing throwout bearing.
In installing a 261, you or who ever did the install would have needed to replace the front bearing retainer with a 1938-47 4 speed front retainer, needed for the clutch design that would fit the 261.
There were two styles of that bearing retainer. 1938-46 and 1946-47 (early and late in 46)designed to work with an input shaft with "oil return grooves on shaft", that moved any oil back into the transmission.
If the wrong retainer is used there can be leakage from the front of the transmission.
A lot of people use a sealed front bearing (but remove the rear seal to allow oil to enter it) to stop oil from exiting the front of the transmission.
You would be safe to run the transmission a little low on oil to prevent oil from leaking out the front.
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