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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> need help with manual trans ID
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Topic Review (Newest First)
10-02-2003 12:27 AM
jimfulco Muncie uses an aluminum case. Saginaw has an iron case with all three shift levers in the side cover. ID info for various ratios can be found at
09-30-2003 11:46 AM
Scuzzy Iron case, I'm pretty sure its a muncie as the first 5 numbers match what's on an m-20/m-21 (39256) its just the last two (58) that have me perplexed
09-30-2003 01:23 AM
Sandflea427SS Is it a cast iron case....aluminum case....????
09-30-2003 12:09 AM
need help with manual trans ID

I pulled the driveshaft off today and redid the u-joints & rear trans seal on my '72 camino today and while I was under there I pulled some numbers off the trans (two birds one stone )

it's a manual 4 speed

it says GM 3925658
then it has an NF but the F is attached to the right leg of the N
that is followed by a small o and a larger 2 ---All this is on the passenger side

sorry if thats a little confusing just trying to describe it as accurately as possible thanks in advance

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