tell me about th375 trannys - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ocbaud · 05-16-2004, 12:43 AM

tell me all you know about them.

it looks like my dad has one of these instead of the original th400 that we thought he had.

he just bought a nice new expensive lokar shifter and it wont install because the tail housing is different

and it is printed 375th on the tailshaft.

87 Shortwide · 05-16-2004, 01:52 AM

something along the lines of a TH400 case with TH350 internals and tailshaft or vise versa i believe...

Opper77 · 05-16-2004, 09:10 AM

found this...

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.

Olds TH-375 ID's:
ID Year(s) Application
OA '73 2V 350 88
OA '74 4V 350 88
OA '75 350 88
OB '75 350 88 (Calif)
OE '75 400 (Pontiac) 88 (exc Wagons

Cowboyd · 05-16-2004, 11:29 AM

I was told it is a TH400 with a shorter tail shaft. The B&M shifter I installed used the TH400 bolt pattern.
Boyd

87 Shortwide · 05-16-2004, 11:37 AM

When I had my TH375 rebuilt, the guy that did it used all TH400 internals for strength. So you can pretty much build a TH400 out of a TH375.

05-16-2004, 12:43 AM	#1
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	tell me about th375 trannys tell me all you know about them. it looks like my dad has one of these instead of the original th400 that we thought he had. he just bought a nice new expensive lokar shifter and it wont install because the tail housing is different and it is printed 375th on the tailshaft.

05-16-2004, 01:52 AM	#2
87 Shortwide Registered User Join Date: Nov 2002 Location: Wichita Ks Posts: 536	something along the lines of a TH400 case with TH350 internals and tailshaft or vise versa i believe... __________________ Daily Driver: 1992 Blazer dropped on rallys Project: 87 GMC shortwide, About to get a little boost

05-16-2004, 09:10 AM	#3
Opper77 Ob-Gyn Kenobi Join Date: Aug 2003 Location: Edmonton, Alberta Posts: 489	found this... 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. Olds TH-375 ID's: ID Year(s) Application OA '73 2V 350 88 OA '74 4V 350 88 OA '75 350 88 OB '75 350 88 (Calif) OE '75 400 (Pontiac) 88 (exc Wagons __________________ '85 GMC Shortbox... I used to have a firm handle on life....then it broke off.

05-16-2004, 11:29 AM	#4
Cowboyd Registered User Join Date: May 2003 Location: Galena, Illinois Posts: 9	I was told it is a TH400 with a shorter tail shaft. The B&M shifter I installed used the TH400 bolt pattern. Boyd __________________ 79' C10 Short Step 355/TH375 W/3.73 & Eaton Posi 1.5"/3" Drop What I have I owe to udders!

05-16-2004, 11:37 AM	#5
87 Shortwide Registered User Join Date: Nov 2002 Location: Wichita Ks Posts: 536	When I had my TH375 rebuilt, the guy that did it used all TH400 internals for strength. So you can pretty much build a TH400 out of a TH375. __________________ Daily Driver: 1992 Blazer dropped on rallys Project: 87 GMC shortwide, About to get a little boost

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