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Mod | | | Forums66 Topics128,072 Posts1,055,906 Members48,429 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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with Ads!  Again, thanks!
| | | | Joined: Feb 2006 Posts: 549 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 549 | The transmission case numbers are GM 392 5658.
Anyone have or know where I can get info on this (year, what it might have come out of, etc.)?
TIA | | | | | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | Are you asking about a Saginaw 4-speed? I have this information for determining which one it is, but not year and application.
Saginaw 4-speed
Grooves 1st 2nd 3rd 4th Notes:
0 2.85 2.02 1.35 1.00
1 2.56 1.81 1.37 1.00 Third gear on cluster has 25 teeth
1 2.56 1.81 1.44 1.00 Third gear on cluster has 21 teeth
2 3.11 2.20 1.47 1.00
3 3.50 2.48 1.65 1.00
This is in phone note form for identifying them at swap meets.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble... | | | | | Joined: Mar 2006 Posts: 319 Shop Shark | | Shop Shark Joined: Mar 2006 Posts: 319 | Google "GM 3925658". Looks like late 60's to 70's passenger car applications from my quick read. Ex. someone was advertising a tranny from a 78 Olds Cutlass 442 with your part number. Your part number shows up on some Camaro boards asking about late 60's, early 70's models.
"Nothing astonishes men so much as common sense and plain dealing." - Ralph Waldo Emerson
| | | | | Joined: Feb 2006 Posts: 549 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 549 | | | |
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