Stock Tranny

Tweety · 03-01-2004, 10:04 AM

What was the stock tranny in a 1972 Olds F-85/Cutlass? I am looking to upgrade the motor, and I am not sure if the TH-350 is going to be able to take what I throw at her.

jdorour · 03-04-2004, 06:19 AM

Generally the TH350 was used with the 6cyl and all 350cid V8’s and the TH400 was used with the 455cid V8. The transmission from the 6cyl is different than the trans used with the V8.
There are different transmission codes used with different engines and heavy-duty options.
The codes don’t really matter if you are not doing a restoration. You will need to be aware of a couple of things:
There are two different bell housings for all GM transmissions Chevy and BOPC.
There are short and long tail shaft THM400
In the late 70’s early 80’s GM built a trans type THM 375B this looks just like a 400 but is a lighter duty unit. Most of the time it was used on the 403 and big cars with the 350.
Lastly 64, 65, 66 and 67 BOPC THM400’s are Switch Pitch units and will require some additional wiring to work the switch pitch converter

eichh2000 · 04-28-2005, 04:04 AM

Its all in how they are built I ran a 350 for years with 500 hp on it and I am currently running 800 horse on my powerglide. Just as long as they have the right clutches you shouldnt have a problem.

yogi442 · 04-28-2005, 06:23 AM

one other note, Olds came with TH400 on 350V8's with factory tow packages. As with my 76 Cutlass. Otherwise TH350 with 350ci V8.

03-01-2004, 10:04 AM	#1 (permalink)
Tweety Junior Member Join Date: Feb 2004 Location: Florence, SC Posts: 6	What was the stock tranny in a 1972 Olds F-85/Cutlass? I am looking to upgrade the motor, and I am not sure if the TH-350 is going to be able to take what I throw at her. __________________ Yellow 1972 Olds Cutlass

03-04-2004, 06:19 AM	#2 (permalink)
jdorour Senior Member Join Date: Feb 2004 Location: Atlanta, GA. Posts: 123	Generally the TH350 was used with the 6cyl and all 350cid V8’s and the TH400 was used with the 455cid V8. The transmission from the 6cyl is different than the trans used with the V8. There are different transmission codes used with different engines and heavy-duty options. The codes don’t really matter if you are not doing a restoration. You will need to be aware of a couple of things: There are two different bell housings for all GM transmissions Chevy and BOPC. There are short and long tail shaft THM400 In the late 70’s early 80’s GM built a trans type THM 375B this looks just like a 400 but is a lighter duty unit. Most of the time it was used on the 403 and big cars with the 350. Lastly 64, 65, 66 and 67 BOPC THM400’s are Switch Pitch units and will require some additional wiring to work the switch pitch converter __________________ 1966 Ninety Eight Convertible - 425 Tri-Carb, Factory Dual Exh, Switch-Pitch THM400, 3.54 Posi. 1966 Catalina Wagon - 421 Tri-Power, M21, 4.11 Saf-T-Trac, 8 Bolt Wheels 1989 IROC-Z - 5.7TPI

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04-28-2005, 04:04 AM	#3 (permalink)
eichh2000 Junior Member Join Date: Apr 2005 Location: minooka Posts: 6	Its all in how they are built I ran a 350 for years with 500 hp on it and I am currently running 800 horse on my powerglide. Just as long as they have the right clutches you shouldnt have a problem.

04-28-2005, 06:23 AM	#4 (permalink)
yogi442 Member Join Date: Dec 2004 Location: Blaine Wa Posts: 72	one other note, Olds came with TH400 on 350V8's with factory tow packages. As with my 76 Cutlass. Otherwise TH350 with 350ci V8.