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I have a 70 Chevelle 350 2bbl auto. I am trying to figure out if I have a THM350 or THM400. The engine code section of this site does not list an engine code of "CNN". I have located this at another site but they are saying a CNN comes with a THM350. My build sheet has a "M40" on it, which indicates a THM 400. Can anyone help me figure this out? I heard that only THM400 were used on big blocks. Any hints? Thanks in advance!! (Right now, I am going with my build sheet, THM400)
 

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What does the pan look like. The TH350 & Powerglide have rather square normal looking pans, the TH400 has a HUGE pan with some interesting angles to it. Also if you can climb under and get it's serial number and post that...

And, yes unless you have a monster small block you don't need a TH400, as they tend to take more input power to run and don't really give their all wiht out a big block.

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Francis Taracido
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Thanks for the info Quadzilla. I will check the pan size/shape. I was told when I bought the car the it was COMPLETELY ORIGINAL. That is why I was wondering IF the 350 2bbl came with the THM400. I will find out this evening. You cant argue with ID #'s and the build sheet. Thanks again!
 

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To expand on what Quad said: (all the autos even though the PG is not a contender here)
PotatoGlide: Square Pan
TH-350: Square with a corner cut
TH-400: Kinda looks like texas if you stare at it long enough!
(you'll get what I mean when you see a 400 pan)

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Steve
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In process of finding a 65
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[This message has been edited by Steve D 64 SS (edited 06-18-99).]
 
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