A couple questions
 

Hey guys, I have been tearing apart the front end of my truck and along the way have run into a few things that have got me stumped. First off, there is a large upper case M stamped on the top side of my transmission. Does this stand for something and what is it there for? Second, what color would the transmission pan on a th350 be? It is blue right now but would like to know the factory color because the truck is being restored to original. Third, are there and if so where are the casting number for the heads located? Couldn't find any tonight while searching for them with my dad. Thanks :chevy:

Re: A couple questions
 

Youll have to take off the valve covers to see the head #s.
No color on the trans pan that i know of. Aircraft stripper aughta do it
M? A tranny guys gonna have to answer that one

Re: A couple questions
 

Here is a picture of the transmission.

Re: A couple questions
 

Bump. Anybody got any info on this M?

Re: A couple questions
 

I have seen a ton of chevy trans and never seen a marking like that! Also from Oregon, about 80 miles south.

Re: A couple questions
 

Looks like someone scratched it on with a putty knife, unless it is painted on. If it is painted on it might be one from an auto wreckers and that would be how they would have marked it for a warranty?

Re: A couple questions
 

It is the original transmission and that M is a raised imprint on the transmision. I scraped the top layer or grease and grime off so you could see it better.

Re: A couple questions
 

GM did mark 4x4 automatic transmission cases with a cast in K

Maybe there is a similar reason for noting these M cases....?

Re: A couple questions
 

turbo 350 trans pans were not painted "bare metal"
the casting numbers are under the valve covers right in the middle of the heads date codes are futher towards the ends of the heads under the valve covers