how to tell a th350 from a th400
 

I was just woundering if someone could tell me how to tell a turbo350 from a turbo400 trans. My trucks trans is option coded as a M49, what trans is that?

Re: how to tell a th350 from a th400
 

Looking at the shape of the pan is the easiet way.

Re: how to tell a th350 from a th400
 

400 oil pan is shaped like Texas.

Re: how to tell a th350 from a th400
 

quick and easy;
kick down cable = TH350
No kickdown cable = TH400

Re: how to tell a th350 from a th400
 

nother quick way,
th400-6 bolts in the tail housing
th350-4 bolts

Re: how to tell a th350 from a th400
 

The top right transmission in the picture is a turbo 400 transmission. I look to see where the modulator valve is. It should be on the passenger side closer to the front when looking at the transmission from the back.

Re: how to tell a th350 from a th400
 

TH350 vacuum modulator faces right
TH400 Vacuum modulator faces back

Re: how to tell a th350 from a th400
 

Boy look at all those ways to tell the difference

Re: how to tell a th350 from a th400
 

Just like everyone else said:

TH350 has a Mechanical (cable) Detent Cable.
TH400 has an Electrical Detent Switch.

Easiest way is the shape of the drainpan.

Re: how to tell a th350 from a th400
 

Thanks for this thread. I now know I have a 350.

Re: how to tell a th350 from a th400
 

Cool to know that people still read threads that are 2 years old.

Re: how to tell a th350 from a th400
 

no 4 years old. I just found out i have a th400 Thanks.

mmmm thread necro

Re: how to tell a th350 from a th400
 

Thanks for the thread, now I know I have a 350 TH.
Is there a preference 350 vs 400? Thanks again

Re: how to tell a th350 from a th400
 

Anyone have a good recommendation of a deeper sump aluminum pan with a drain plug like the one pictured above?

Re: how to tell a th350 from a th400
 

I've had a few of these over the years. They don't exactly give them away, but if you like quality, you've found the best.

http://mag-hytec.com/store/index.php...products_id=97
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Re: how to tell a th350 from a th400
 

Here is what I used on MY T350
http://www.jegs.com/i/Hughes+Perform...FQzNnAodpGwAaQ

Re: how to tell a th350 from a th400
 

I know this is a really old thread ,but it is still VERY useful to us that are not quite up to the level of some of you other guys . I figured out i have a TH350 thanks to this thread without breaking any kind of sweat. thank you everyone for sharing your knowledge. :chevy:

Re: how to tell a th350 from a th400
 

Ok, OP is long gone, however GM did cause some confustion by listing the same SPID code M49 for both "turbo hydramatics" in some years.

Re: how to tell a th350 from a th400
 

But the SPID was telling the truth... :lol:

Gary

Re: how to tell a th350 from a th400
 

Right on fellas, and thanks blukangoo for the unmistakable picture of the two different pans.

Yea, this thread is old as crap, but it's the first Google search result that appears when you do "how to tell th350 from th400" and it was worth my efforts to log into the site and surf around like old times.

I got a camaro last month and was wondering if it had a th350 or th400. Figures the best truck forum out there had the answer to my question.

Upon deep investigation, if I had only waited 7 more days I could have made this a 9 year spread from initial post to my reply. Oh well, guess nobody can be that awesome.

Re: how to tell a th350 from a th400
 

another quick and easy......governor gear has a 4 bolt cover on a T400, a clip bail cover on a T350

Re: how to tell a th350 from a th400
 

Old thread but just read this. I have a 350 (according to PAN) and the Vacuum modulator faces back??? SO which is it??

Re: how to tell a th350 from a th400
 

Yeah.... both clues tell you its a 350...

Re: how to tell a th350 from a th400
 

It say's "TH400 Vacuum modulator faces back"

Unless I'm looking at it wrong, my 350 modulator faces BACK??

Re: how to tell a th350 from a th400
 

It doesn’t.
He was wrong.
Turbo 350 faces back.
Yours does.