Enjoy 5% OFF at VEVOR Canada! and Support Canadian Poncho at the Same Time!
Members Login
Username 
 
Password 
    Remember Me  
Canadian Poncho Homepage -> Canadian Poncho -> The Lounge -> Big block with TH350 automatic?
Post Info TOPIC: Big block with TH350 automatic?
4SPEED427


A Poncho Legend!

Status: Offline
Posts: 49994
Date:
Big block with TH350 automatic?
Permalink  

In an effort to not derail another thread (because I am often accused of being the king of derailments (and I admit to being bad for that) ), I want to ask a question here.

Does anyone own or know of an original 454 powered 1973-1976 Chevy/GMC 1/2, 3/4 or 1 Ton with it's factory installed automatic transmission still in it? If so, is it a TH350 or a TH400?

Interesting debate on the other thread. Ray posted a web page that says a 454 came with a TH350 in those years, I say never.

Prove one of us wrong!

__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
4SPEED427


A Poncho Legend!

Status: Offline
Posts: 49994
Date:
RE: Big block with TH350 automatic???
Permalink  

And it just occurred to me for certain that at least one 74 had a TH400. A few years ago, I bought a 74 454 2wd long box from one of my co-workers. His dad bought the truck brand new at our dealership. I parted it out and it was most certainly a TH400 in that truck.

__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
StriperSS


Poncho Master!

Status: Offline
Posts: 2252
Date:
Permalink  

I tried to find my sales brochures for those years, but wasn't able to. Carl, if you have the parts books for those trucks, there will be clues that should tell you. Ie, trans mounts, cross members, trans cooling lines, by engine, trans designations.

John



__________________

Victoria, BC
StriperSS


Poncho Master!

Status: Offline
Posts: 2252
Date:
Permalink  

I'm going to say Turbo 400's were the one, especially in a truck application.



__________________

Victoria, BC
4SPEED427


A Poncho Legend!

Status: Offline
Posts: 49994
Date:
Permalink  

StriperSS wrote:

I tried to find my sales brochures for those years, but wasn't able to. Carl, if you have the parts books for those trucks, there will be clues that should tell you. Ie, trans mounts, cross members, trans cooling lines, by engine, trans designations.

John




That's a good point. There would be no TH400 listed for those years if a 454 didn't have it I would think. It would make no sense to have a TH350 behind a 454 but yet offer a TH400 behind a small block or 6 cylinder. I'll check those books.

__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
73SC


A Poncho Legend!

Status: Offline
Posts: 20242
Date:
Permalink  

[Chart showing transmissions used in 1973 - 1987 Chevy trucks. Includes gear ratios.]

 

1973 Chevy Trucks.jpg

 



Attachments
__________________

Ray White, Toronto ON

Formerly - The one and only 1973 LeMans 454 "Astro-Jet"

Built March 9, 1973 - Oshawa ON

1993 Corvette Convertible LT 1

Built January 10, 1993 - Bowling Green Kentucky 

 
4SPEED427


A Poncho Legend!

Status: Offline
Posts: 49994
Date:
Permalink  

454 th.jpg

Attachments
__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
4SPEED427


A Poncho Legend!

Status: Offline
Posts: 49994
Date:
Permalink  

1975 75 454 th.jpg

Attachments
__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
4SPEED427


A Poncho Legend!

Status: Offline
Posts: 49994
Date:
Permalink  

1974

74 454 th.jpg

Attachments
__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
427carl


A Poncho Legend!

Status: Offline
Posts: 35601
Date:
Permalink  

I had a 1974 Nova SS hatchback with a 350 2bbl and 400 turbo 



__________________

 
4SPEED427


A Poncho Legend!

Status: Offline
Posts: 49994
Date:
Permalink  

M49 is not a TH350 as it says there. M49 was a Turbo Hydramatic option code, be it a TH350 or TH400 that was installed. Apparently starting in 74 it was broken out correctly according to transmission installed. http://67-72chevytrucks.com/vboard/showthread.php?t=554460 m49.jpg

Attachments
__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
StriperSS


Poncho Master!

Status: Offline
Posts: 2252
Date:
Permalink  

I parted out a 71 GMC with a 402 and it had a turbo 400 back in about 85.
Alco parted out a 71 Belair with a 350 2 bbl, turbo 400. I can't see them putting a turbo 350 behind a big block in a truck, knowing how trucks got used.

__________________

Victoria, BC
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Elroy


Poncho Master!

Status: Offline
Posts: 2063
Date:
RE: Big block with TH350 automatic?
Permalink  

I have never seen a TH350 behind a big block from the factory. I have a 77 TH400 out of a wrecked 454 3/4 ton. It has the HD case and the bolt on rear yoke. Wanna buy it , 100 $ takes it !

__________________
67Poncho


Uber Guru

Status: Offline
Posts: 3665
Date:
Permalink  

Talked to a buddy of mine that had an original '79 heavy 1/2 with a 454... THM400 is what it had.... and I say had as it was toasted...



__________________

Vincent Jr.
CdnGMfan


Canadian Poncho Superstar!

Status: Offline
Posts: 4893
Date:
Permalink  

In 1967-68, the only Turbohydramatic offered in light duty trucks was the TH400, even with a 250 six! They did build them.

I have a picture in a 1974 brochure of a pickup chassis with a 350, fully dressed including the infamous saddle fuel tank. It seems to me the small blocks came that year with a TH350 with a long tailhousing. Check out the GM Heritage site in the U.S. where you can download the SAE specs in .PDF form. They go into great detail on all specs and will tell you all. The TH350 had a 2.52:1 1st while the TH400 had a 2.48:1 1st.


Don't get too excited when you see M40 vs. M38 on some car spec sheets; M40 was often used generically to refer to a 3-speed automatic, even when the specs called for an M38 TH350.



I can't check my reference material right now because I am in India as we speak.



__________________

67 Chevelle Malibu Sport Coupe, Oshawa-built 250 PG never disturbed.

In garage, 296 cid inline six & TH350...

Cam, Toronto.


I don't judge a man by how far he's fallen, but by how far back he bounces - Patton
65 SD L79


Canadian Poncho Superstar!

Status: Offline
Posts: 9472
Date:
Permalink  

no TH350 behind a big block but you could get a glide behind it. sad



__________________
GLHS60


Poncho Master!

Status: Offline
Posts: 1914
Date:
Permalink  

CdnGMfan wrote:

In 1967-68, the only Turbohydramatic offered in light duty trucks was the TH400, even with a 250 six! They did build them.



 Makes sense as the T-350 wasn't introduced until the 1969 model year.

 

Thanks

Randy



__________________

Sherwood Park
Alberta, Canada

 
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
Canadian Poncho Homepage -> Canadian Poncho -> The Lounge -> Big block with TH350 automatic?
Tweet this page Post to Digg Post to Del.icio.us
.
Support Canadian Poncho!
Select Amount:
<
.
.
.