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Old 11-15-2011, 09:27 AM
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GM Manual Transmission Identification?

The right side numbers are 3925658 8338GM NFc4.
The shifting case is 52254 GM7.
Can anyone help with identifying this 4spd? Thanks!

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Old 11-15-2011, 10:12 AM
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that was the right side..the left side numbers are...

Left side shows GM 6261888?
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Old 11-15-2011, 11:02 AM
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Awfully close to a Muncie (3925660). Not a T10 (1304 series); If its iron and has all three shift levers on the side cover, its a Saginaw.
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Old 11-15-2011, 11:12 AM
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I don't have my book right now.

Any idea which year?
Is it from a car or truck?

My books only cover 65 - 75, but I'll look them up tonight.
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Old 11-15-2011, 12:21 PM
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3925658 is the p/n for the 1968-'69 Muncie "M-type" main case (casting number 3925660).

I'm thinking this is a cast iron Saginaw, the casting number would be 39255656 though. Casting numbers are notorious for being vague and hard to read.
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Old 11-15-2011, 06:01 PM
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3925656 is the casting number for the saginaw used in 68-75 at least. But the other numbers don't match the extension or sidecover casting numbers.
Like Cobalt said, it is very easy to mistake a 6 for an 8 in these castings.

3925658 does not match any casting numbers in my books.

Any more information about this trans? Pics?
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Old 10-31-2013, 03:02 PM
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Quote:
Originally Posted by starnest View Post
3925656 is the casting number for the saginaw used in 68-75 at least. But the other numbers don't match the extension or sidecover casting numbers.
Like Cobalt said, it is very easy to mistake a 6 for an 8 in these castings.

3925658 does not match any casting numbers in my books.

Any more information about this trans? Pics?
My '78 Monza has the same number as above (3925656) on the case of my 4spd Saginaw. Hope this helps. If anyone ha**************************Thanks.

Last edited by Crosley; 10-31-2013 at 04:16 PM. Reason: no wanted ads on forums
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Old 10-31-2013, 10:40 PM
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Did you know that Google is your friend?

Your friendly Google search results.

The answer is at the link above.

Last edited by mmerlinn; 10-31-2013 at 10:46 PM.
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Old 10-31-2013, 10:55 PM
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