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Discussion Starter · #1 ·
I was going to sell my original tranny..
A guy asked me what it was, so i gave him the info..
He told me it is rare, and it might not fit on this Chevy...
He has a 73 Chevy Nova 350 c.i.

Umm.. What could be so rare about my tranny??

It says M40 on it...
I really don't know much about transmissions..

What is so special about it???
I know that my engine option was rare for my car.. (The original engine was a SBC 400 C.I)

TIA guys.

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1972 Chevelle Malibu custom 4dr
Restoration started: February 10th 2001
Pic 1 , Pic 2 , Pic 3 and Pic 4
TC member #1278
 

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The M-40 is a TH400. Is a really good and reliable automatic trans. Will fit just about anything.

Why do you want to sell it?

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Nick Pratt,

TC #1442

Proud owner of a 66 Malibu -
355, four speed, 3.08 pegleg

14.94 @ 93.75

<A HREF="http://www.public.iastate.edu/~amcarthu" TARGET=_blank>
Andy and Nick's Muscle Car Half-way House</A>
 

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Discussion Starter · #3 ·
<BLOCKQUOTE>quote:</font><HR>Originally posted by Chevelle66:
The M-40 is a TH400. Is a really good and reliable automatic trans. Will fit just about anything.

Why do you want to sell it?

<HR></BLOCKQUOTE>

WHAT?!?!?
I had a TH400??????
My god! I never knew..
I thought it was a TH350...
So i got the original out, and placed a 69 Camaro TH350....
EEK!
I didn't know that...
How come a SB came with a TH400???
Wow.. You really surprised me there.

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1972 Chevelle Malibu custom 4dr
Restoration started: February 10th 2001
Pic 1 , Pic 2 , Pic 3 and Pic 4
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Choas
I couldn't help but bud in here.
Where does it sat M 40?
You need to look and see what kind of TH400 this trans.really is.There were different types for different applications.
On the passenger side,there is an Aluminum tag rivoted to the trans.See what this says.It should look something like C 70 Y in big silk screened letters.DON'T CLEAN IT WITH PAINT STRIPPER or similar.You will wipe it right off.
Underneath the silk screening,you should see very small numbers actually stamped into this alumnum tag.Write all this stuff down and reprint it here just as it appears.
Now on the Drivers side of the trans.There should be a VIN# stamped into the case.Right where the drain pan bolts to the case,and the rubber boot fits for the shift linkage.It is small but visible if ou look sideways,not on top.

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Rick Peters
ACES#175
1970 L-78...ON THE MOVE
 

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Discussion Starter · #5 ·
<BLOCKQUOTE>quote:</font><HR>Originally posted by mr70:
Choas
I couldn't help but bud in here.
Where does it sat M 40?
You need to look and see what kind of TH400 this trans.really is.There were different types for different applications.
On the passenger side,there is an Aluminum tag rivoted to the trans.See what this says.It should look something like C 70 Y in big silk screened letters.DON'T CLEAN IT WITH PAINT STRIPPER or similar.You will wipe it right off.
Underneath the silk screening,you should see very small numbers actually stamped into this alumnum tag.Write all this stuff down and reprint it here just as it appears.
Now on the Drivers side of the trans.There should be a VIN# stamped into the case.Right where the drain pan bolts to the case,and the rubber boot fits for the shift linkage.It is small but visible if ou look sideways,not on top.

<HR></BLOCKQUOTE>

I did that already.. Put the numbers in Tag team a while back, and someone told me it is a M40...
But i made a search and i found out that the 400 SB came with the M40 transmission.. (on the 1970 Monta Carlo for instance..)
I didn't know that..

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1972 Chevelle Malibu custom 4dr
Restoration started: February 10th 2001
Pic 1 , Pic 2 , Pic 3 and Pic 4
TC member #1278
 

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I doubt you had a TH400 there. If you did then you would of had all kinds of problems when putting in the TH350. Wrong yoke, wrong driveshaft length, etc. If your camaro TH350 fit right in then you had a TH350. The TH350 pan is a square with one corner cut off.

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Dave
70 chevelle ss396 conv
66 chevelle ss396 hdp/conv
72 chevelle
TC member #493
Never forget Earnhardt!
 

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<BLOCKQUOTE>quote:</font><HR>Originally posted by ChaosMalibu:
How come a SB came with a TH400???
<HR></BLOCKQUOTE>

Probably because whomever swapped the original motor for the 400 also changed out the tranny...


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Russ (or Steve)
1965 Malibu 283/PG/A/C
Now 283/TH-350 soon to be 383/TH-350
My Homepage (Updated 5/31/2001)
Team Chevelle Member #71
 

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Discussion Starter · #8 ·
<BLOCKQUOTE>quote:</font><HR>Originally posted by Steve D 64 SS:
Probably because whomever swapped the original motor for the 400 also changed out the tranny...


<HR></BLOCKQUOTE>

The original engine WAS a 400... Matching #s.

And Dave, I didn't change the engine myself because i don't have a Garage.. I gave a machanic to do that.. I think he did have some problems.

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1972 Chevelle Malibu custom 4dr
Restoration started: February 10th 2001
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ChaosMalibu
I have never seen a TH400 say M40 on it specifically.
I did a search in TagTeam for your past post,and could find nothing on your past information about this.Could you post all the information again that I requested?
It can all be easily sorted out as far as its originality and application.

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Rick Peters
ACES#175
1970 L-78...ON THE MOVE

[This message has been edited by mr70 (edited 11-03-2001).]
 

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Discussion Starter · #10 ·
It is really not clear..
But it is something like:
72 BD 634074

Those are the only things that i can see on the tranny.. All the other stuff is gone.

I was told to see if the oil pan is squre or in an odd shape.. The oil pan is weird... has a lot of little curves on it...



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1972 Chevelle Malibu custom 4dr
Restoration started: February 10th 2001
Pic 1 , Pic 2 , Pic 3 and Pic 4
TC member #1278
 

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That is conflicting material.It does not decipher very accurate.
Lets go another way.
Where is the Moduator located?
On TH350,it is located on the rear of trans.
On TH400,it is located on the Passenger side,towards the front of Trans.
The modulator is a large valve about the size of a small glass.It has a Vacuum line coming out of it.

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Rick Peters
ACES#175
1970 L-78...ON THE MOVE
 
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