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Fixing the old truck

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Joined: Sep 2025
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'Bolter
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I’m having a bit of a challenge sourcing an oil seal for the output shaft on my 3 speed manual transmission (1955 235 engine, Apache 3100). I think I found one on eBay but worry about compatibility.

Anyone have any suggestions? Is there a specific brand and part number that I should search for? An online store (called Summit Racing but they didn’t have)?

Is there a way to find which specific transmission I have? I know which casting numbers to use for the block and head but no clue where to start on the transmission.

Thanks

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Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Joined: May 2015
Posts: 9,830
Welcome to Stovebolt.

From what I find in the 1929-1957 Parts manual, you have two options (highlighted on the attached.) A good parts store can either use the dimensions and the GM PN to cross over to a current manufacturer's number.

NAPA's website says their Part #: NOS 22340 fits. It matches the dimensions in the first seal I highlighted.
Attachments
Transmisson seal.jpg (50.16 KB, 52 downloads)

Last edited by klhansen; 09/18/2025 5:46 PM. Reason: added more info

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
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'Bolter
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National 9613S Oil Seal


~ BD.
You won't find me in an old folks home
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'Bolter
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Thank you @klhansen and @Guitplayer!

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'Bolter
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9613S is available at Auto Zone for about $5
Also fits 350 TH, Powerglide, and overdrive transmissions.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
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'Bolter
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Thanks rfs56trk. Seal acquired!


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