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post #1 of 5 (permalink) Old Jan 4th, 00, 10:51 AM Thread Starter
Join Date: Jan 1999
Location: Raymore, MO USA
Posts: 21

I have recently been GIVEN a muncie tranny. I called my Chevy dealer about the numbers and he said he couldn't tell me what it is. Anyone out there know their trannies?

Here's the numbers:
tail housing 3846429
left cover plate 3831707
body 3925660
stamped on body P8D26
Is this M22, M21 or just an M? Thanks in advance.
Lou M is offline  
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post #2 of 5 (permalink) Old Jan 4th, 00, 02:13 PM
Tech Team
Join Date: Oct 1998
Location: Ramsey, MN, USA
Posts: 76


Post this on the Chevelle site under "Tag Team" and you'll most likely find out what you need to know.

70 & 1/2 RS
SB406 & M20 4spd
9" rear

70 Malibu 350/TH400

Gold member #103
Driveline Technician

[This message has been edited by Scooter (edited 01-04-2000).]
Scooter is offline  
post #3 of 5 (permalink) Old Jan 4th, 00, 03:49 PM
Senior Tech
Join Date: Aug 1998
Location: Ft Wayne In.
Posts: 305

I can tell ya here!
It is a 1968 tranny, but it would depend on how many rings are on the input shaft to whether it is an M20, M21, or M22.
26- April 26th

W-Willow Run assembly plant...not sure what was built here in '68, maybe Novas.
336031-VIN from the car it came from.

Rings on the input shaft indicate what the transmission is...
No rings- Possibly an M22 if the gearset is original. M22's will also have a drainplug in the case.
1 ring-M21 close ratio
2 rings-M20 wide ratio
Dave Birdwell is offline  
post #4 of 5 (permalink) Old Jan 5th, 00, 03:17 AM Thread Starter
Join Date: Jan 1999
Location: Raymore, MO USA
Posts: 21

Thanks Dave. Will check the input shaft for rings. Regardless of it is, I think I got a hell of a deal for free. I swear the guy told me it's out of a GTO. Oh well, still GM. Thanks again!

Lou M is offline  
post #5 of 5 (permalink) Old Jan 6th, 00, 10:29 AM
Gold Lifetime Member
Join Date: Dec 1999
Location: Yorkville, Illinois USA
Posts: 22,121

If you don't need your gto muncie, give a hooer, I'm shopping!!

JimM is offline  
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