[E.Furgal]

Hello.
is there a way to tell one from the other..
I got a (what it looks like a th350) out of a camper (late60-early70) basicly a van cab with a camper back..
more than a few have said it might be a th375 going off what it's from. not from looking at the trans itself.

thanks..

Also whats the differences internally..

[rick 427]

BASICALLY ,a TH375 is a turbo 400 internally, except with 1 less clutch in each drum, and a smaller TH350 splined output shaft...the modulator is located on the front pass. side of the trans,near the filler tube hole......If its a TH350,The modulator is located in the rear of the case on the pass. side.,near the trans mount holes. The TH375 was the more heavy duty of the 2. Hope this helps.

[E.Furgal]

so if the mod. valve is like a 400 it's a 375 if it's in the spot of a th350 it's a 350

[SSedan64]

There're 2 different TH375 Trans, TH375 & TH375B.

( TH-375
A medium duty version of the TH-400. On the underside of the trans, right where the tail housing bolts up, the letters "TH-375" can usually be found cast into the trans housing.

Pan Shape:
A TH-375 pan is the same shape and size as a TH-400.)

( TH-375B
A heavy duty version of the TH-350.

Pan Shape:
The TH-375B pan is the same shape and size as the TH-350. )

( TH-375
There are two TH-375s: the TH-375 or TH-375A, and the TH-375B. The TH-375A is the more common, medium duty version of the TH-400. The TH-375B is a less common, heavy duty version of the TH-350. Used in certain full size Buicks in the mid 70's.

Durability:
A longshaft TH-375A is like a longshaft TH-400, but it uses the smaller diameter yoke from the TH-350. Pan shape is that of the TH-400. The only difference is the output shaft and the tailshaft housing. The TH-375A has the guts of a TH-400 with the output shaft of a TH-350. It was used in full size cars, and it effectively shortened the drive shaft. The TH-375A is also often swapped into big cars as a direct replacement for dead longshaft TH-350s.

Electrical Connections:

Kickdown:
Same as TH-400 (TH-375A), or TH-350 (TH-375B). )

Info above from 442.com's site.

http://www.442.com/oldsfaq/oftrn.htm#TRAN Auto Transmission Identification
http://www.442.com/oldsfaq/oftrn.htm#TRAN Auto Transmission Comparison

[mmerlinn]

Originally Posted by E.Furgal

Hello.
is there a way to tell one from the other..
I got a (what it looks like a th350) out of a camper (late60-early70) basicly a van cab with a camper back..
more than a few have said it might be a th375 going off what it's from. not from looking at the trans itself.

thanks..

Also whats the differences internally..

There are two different types of TH375 transmissions.

1) A TH350 with a 12" tail housing is a TH375B. Only differences between a TH350 and a TH375B are the output shaft and the tail housing. All shorter tail housing transmissions are TH350s.

2) A TH400 with a 27 spline output shaft is a TH375C. All TH400s in GM vehicles have output shafts with 32 splines. Only differences between a TH400 and a TH375C are the output shaft and the tail housing.

No idea why GM named two totally different transmissions with similar names.

[E.Furgal]

it's a short tail.. so as I thought it's just a th350..
and thats fine by me..
as I have a th400..
as they are getting hard to find around here.. cheap.. some yards want 300.oo+ for a th350 shorty core..

it'll most likely sit in a corner.. as I think I'm going to build a 2004r..
or hang a g/v off the back of the th350 or th400..
if I only could make up my mind.. on what engine to drop in it..
the unbuilt 496(488) or the 355
the 71 el camino is to blame... it cause the big block itch.. with it's 402..
dam you elcamino, dam you..


thanks for all the help and info. and links.. helps learn ..
even if I never ever use one.. it's good to know...
thanks again..