[teamgreen70SS]

I have a 4sp tranny with #s 3978764 GM1... can anyone help id this... Thanks

[Mike]

That number is a tail housing for a Muncie 4 speed from a 1970 – 1974 w/passenger side speedo & 32 spline output.
Tag still on it?
Also might look for the trans serial number -stamped and starts with P.

[teamgreen70SS]

Thanks, tranny is at a friends house but i took a few #s off it and i do have p1t10a ... does that help? dont know if the ones are i's or not... Thanks again

[Mike]

P = Muncie
1 = 1971
T = December
10 = Day of month
A = M20
Also look for a partial VIN stamped on it along with the tag ,if the tag's still there.

[teamgreen70SS]

ok i will look next time i'm there...got another # off the side 3925661... mean anything? also have another # from another tranny off the tailhousing... 3846429. Thanks a bunch!!

[Mike]

3925661 = 1970 - 1974 main case

Depending on casting date ,could be either tailhousing:
3846429 = 1963 "Thin Fin Tail" Driver speedo 27 spline
3846429 = 1963-1965 Regular thick web, driver speedo, 27 spline

[teamgreen70SS]

Ok, THANKS AGAIN!!!! Heres the deal... my Dad had this car, (70 Chevelle SS 454 LS-6) for years, i mean i will be 41 in Aug and i remember this car when i was a kid, well 2 yrs ago in Mrch my Dad passed and i ended up with it, motor is in it dont remember if the tranny is in it or not, I got it stored in my buddys shed, it needs to be restored, but i mean it is in pretty good shape, but i would restore it cause thats what my Dad always wanted so I'm just goin through all his extra parts and stuff, the car is all together, just needs to be redone, another thing is i got ahold of the original owner (only lives 30 miles from me) and i remember when my Dad had it the motor #s were not coming up, so after my Dad passed i got ahold of this guy and he said at 21k miles GM put in a replacement shortblock, so i dont know....... but thats where i am, well Thanks Again for all your help........ Thanks, Russ

[Mike]

See what's on the stamp pad and get any other info from this pic that you can


You might start another thread in the appropriate section if your looking for other than trans info.

[teamgreen70SS]

Ok, thanks