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Joined: Feb 2002
Posts: 562 Likes: 1
Oil Can Mechanic
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OP
Oil Can Mechanic
Joined: Feb 2002
Posts: 562 Likes: 1 |
I have what appears to be a 3 speed 34 1/2 ton transmission . I can not find the casting numbers in my parts book. Serial # DB25433 or maybe DB25633. Case number 590715, cover number 590591. I thought all 1/2 tons were 4 speed ? Thanks
Dick
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Joined: Feb 2002
Posts: 562 Likes: 1
Oil Can Mechanic
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OP
Oil Can Mechanic
Joined: Feb 2002
Posts: 562 Likes: 1 |
Also this trans code is C-11-5
Dick
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Joined: Mar 2002
Posts: 1,739 Likes: 2
ChatMaster - 1,500
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ChatMaster - 1,500
Joined: Mar 2002
Posts: 1,739 Likes: 2 |
I would figure if number is not in any Chev parts book it's probably not Chev. Anyway the date code is March 11th, 1925 or 1935 or 1945? I would expect it may be Pontiac or other GM.
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Joined: Jul 2009
Posts: 1,478
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Jul 2009
Posts: 1,478 |
You will need to look in a replacement trans number book. As the transmissions wore out the factory, over the years, made replacements, under a different casting numbers for the year issued. The originals were painted black. Most rebuild shops painted them blue so they could tell if it had been rebuilt by a local shop. This was common practice.
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Joined: May 2010
Posts: 822
ChatMaster - 750
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ChatMaster - 750
Joined: May 2010
Posts: 822 |
"I have what appears to be a 3 speed 34 1/2 ton transmission . I can not find the casting numbers in my parts book. Serial # DB25433 or maybe DB25633. Case number 590715, cover number 590591. I thought all 1/2 tons were 4 speed ?"
Dick,
Having owned the same '36 PU since 1965 I think I have the information on that trans your seeking. Please let me know if you'd like to discuss it privately.
Ray W raywaldbaum@gmail.com
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Joined: Nov 2004
Posts: 435 Likes: 2
Backyard Mechanic
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Backyard Mechanic
Joined: Nov 2004
Posts: 435 Likes: 2 |
That is the transmission that I have in my 1936 GMC T14. The three speed was standard and a four speed was optional. 1936 was the last year that is was used in small trucks.
1936 GMC T-14 low cab. TA for 1935-37 GMC, Director of the Gulf Coast Region
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
If the case is from a 1935 or prior the speedometer gear will be below center if the rear shaft. If for a 1936 above center.
A 4 speed was always an option for a 1/2 ton truck.
Gene Schneider
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