unknown 4 speed transmission - Team Camaro Tech
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post #1 of 12 (permalink) Old Mar 18th, 01, 10:33 AM Thread Starter
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Cool

I found a GM 4 speed standard transmission and want to identify it. There are very few markings on the case. The biggest marking is a GM 29, there is also a small GM 75 on the tailhousing. If you could help, I would appreciate it.
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post #2 of 12 (permalink) Old Mar 18th, 01, 10:59 AM
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Tim
 
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Is it aluminum?
Where are the shift levers?
What is the spline count on the input/output shafts?
I don't know using the GM numbers you provided, sorry.
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post #3 of 12 (permalink) Old Mar 18th, 01, 12:06 PM Thread Starter
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It has a cast iron case. It has 10 splines on the front shaft, and 27 splines on the rear shaft. I have a picture if that would help. Thank you
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post #4 of 12 (permalink) Old Mar 18th, 01, 03:03 PM
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Are all the shift levers in the side cover? If so it is a Saginaw. They are no Muncie but they can be made quite servicable and are strong enough for a lot of combos.

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post #5 of 12 (permalink) Old Mar 18th, 01, 03:19 PM Thread Starter
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Yes the shifting forks are on the side.
I appreciate your help. I need to find a website where I could confirm it. I want to sell it to get a rebuild kit for my 4L60.
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post #6 of 12 (permalink) Old Mar 18th, 01, 03:55 PM
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Bill
 
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James,
Find a shop with a Hurst Shifter catalog. It has a very good section on id'n the transmissions. It shows pictures of the side covers etc.

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Bill Koustenis
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1971 Chevelle "Heavy Chevy" original owner
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post #7 of 12 (permalink) Old Mar 18th, 01, 04:50 PM Thread Starter
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Thank you BillK, I will do that.
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post #8 of 12 (permalink) Old Mar 19th, 01, 04:11 PM
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post #9 of 12 (permalink) Old Mar 19th, 01, 04:33 PM Thread Starter
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Thank you rick!
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post #10 of 12 (permalink) Old Mar 19th, 01, 04:51 PM Thread Starter
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I can't decide if it is a m-22 or a saginaw, I am leaning towards a saginaw, but the picture doesn't look right. This is turning out to be a tough one. Do you think a transmission shop like AAMCO would have a clue or not?
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post #11 of 12 (permalink) Old Mar 19th, 01, 06:38 PM
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If it is a Saginaw it will have all 3 shift levers on the side cover. If it was a Muncie M-20, M-21, or M-22 it would have an aluminum case, not cast iron. If it was a T-10 Borg Warner with a cast iron case it would have two shift levers in the side cover and one in the extention housing. Muncies have two levers in the cover and 7 bolts holding it on. T-10s have 9 bolts.

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'69 RS/SS396 pro street
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post #12 of 12 (permalink) Old Mar 20th, 01, 03:35 PM Thread Starter
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Then I guess that settles it we are all stumped. I appreciate the info and I will post the answer to our little mystery when I get it. Thanks to all of you!!!!
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