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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: Oct 2012 Posts: 233 'Bolter | | 'Bolter Joined: Oct 2012 Posts: 233 | My stock 1953 SM420 4 speed transmission has the wind back front seal. I can not keep it full of 90 wt mineral oil. By full I mean within a half inch of the fill plug. The tans operates properly however oil leaks out the clutch cover. In a few hundred miles it is below where you can touch with your little finger. Question how full should I fill this transmission?
Last edited by MtneerMike; 07/08/2016 9:50 PM.
1953 Chevy 3100 261 and SM420 53Chevy 31001953 Mack Firetruck 1972 Porsche 911 1986 Honda Goldwing
| | | | | Joined: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | should be kept even with filler plug hole. 1/2 inch down max.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
| | | | | Joined: Oct 2012 Posts: 233 'Bolter | | 'Bolter Joined: Oct 2012 Posts: 233 | Thanks bartamos, that is what I thought.
1953 Chevy 3100 261 and SM420 53Chevy 31001953 Mack Firetruck 1972 Porsche 911 1986 Honda Goldwing
| | | | | Joined: Oct 2013 Posts: 331 Shop Shark | | Shop Shark Joined: Oct 2013 Posts: 331 | Mine leaks like a stuck pig, too. Although I don't think it's leaking out through the front yet.
1950 4100 - unrestored and driven weekly for almost no reason at all.
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | To the filler plug hole when oil/transmission is hot.
About 1/2" below the hole when oil/transmission is cold. | | |
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