The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 12-06-2018, 05:24 PM   #1
plowro8
Registered User
 
Join Date: Jun 2018
Location: Indianapolis IN
Posts: 114
New Transmission

I recently put a 350 crate motor in my 72 Chevy and kept the old TH350 trans. As it turns out, the old trans hasn't fared well and I have decided to replace it. Looking for advice on which replacement to go with, and from where to buy. I am inclined to just replace it with another TH350. Thanks for the input!

Ryan
plowro8 is offline   Reply With Quote
Old 12-06-2018, 06:10 PM   #2
plowro8
Registered User
 
Join Date: Jun 2018
Location: Indianapolis IN
Posts: 114
Re: New Transmission

Also, I need to know how long the tailshaft is, 6 or 9 inch. Where exactly to I measure from? It looks like there are two possible areas to measure from (seams, if you will). Need to make sure I order the correct one
plowro8 is offline   Reply With Quote
Old 12-06-2018, 06:19 PM   #3
hotwls13
Registered User
 
Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 308
Re: New Transmission

I'm interested in the answers you receive. I'm going through a similar situation with my 70 GMC. Though I've got the old 350 in mine. What crate motor did u go with and how much was it?
hotwls13 is offline   Reply With Quote
Old 12-06-2018, 06:23 PM   #4
plowro8
Registered User
 
Join Date: Jun 2018
Location: Indianapolis IN
Posts: 114
Re: New Transmission

Quote:
Originally Posted by hotwls13 View Post
I'm interested in the answers you receive. I'm going through a similar situation with my 70 GMC. Though I've got the old 350 in mine. What crate motor did u go with and how much was it?
https://www.summitracing.com/parts/m...ctc1/overview/

I got this one, and I love it. It's advertised at 365 HP but mine dyno'ed at 382. Love the engine... sounds great and has tons of power.
plowro8 is offline   Reply With Quote
Old 12-06-2018, 07:03 PM   #5
hotwls13
Registered User
 
Join Date: Mar 2018
Location: Bakersfield, CA
Posts: 308
Re: New Transmission

Quote:
Originally Posted by plowro8 View Post
https://www.summitracing.com/parts/m...ctc1/overview/

I got this one, and I love it. It's advertised at 365 HP but mine dyno'ed at 382. Love the engine... sounds great and has tons of power.
Very nice!! Someday.
hotwls13 is offline   Reply With Quote
Old 12-06-2018, 09:43 PM   #6
AussieinNC
Moderator
 
AussieinNC's Avatar
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,152
Re: New Transmission

Measure from back face of trans case to end of output shaft


Assuming 2 WD trans,,,there are actually 3 lengths

Short 6"
Intermediate 9"
Long 12"

Post a pic of the old trans and someone will identify it for ya...

Find yourself a local trans shop that has a good reputation...that way if you get any issues you will have a local support / warranty loop...



__________________
Family and country before all others...

2006 Chevy Silverado (Daily Driver)
2012 Chevy Equinox


Last edited by AussieinNC; 12-07-2018 at 08:51 PM.
AussieinNC is offline   Reply With Quote
Old 12-07-2018, 12:09 AM   #7
truckster
Senior Member
 
truckster's Avatar
 
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,760
Re: New Transmission

Quote:
Originally Posted by plowro8 View Post
Looking for advice on which replacement to go with, and from where to buy. I am inclined to just replace it with another TH350. Thanks for the input!

Ryan
That's definitely going to be the easiest and least expensive option. Unless you drive a ton of miles you'll take forever to break even on an overdrive transmission.
__________________
I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson
truckster is offline   Reply With Quote
Old 12-07-2018, 10:54 AM   #8
Mike C
Registered User
 
Mike C's Avatar
 
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,709
Re: New Transmission

Assume your truck has the OEM TH350 and it will be the short shaft. Make some assumptions on $: Rebuilt TH350=$750. TH200 4R=$1500. So you only have to recover $750 and in enjoyment and driveability that is easy to justify. TH 200 4R is same overall length as TH350 short tail. Uses same driveshaft. Only have to move crossmember back to TH400 position... Here are some links I found on a Google search. Remember, buyer beware when it comes to auto transmission rebuilders... Pick one with a good reputation for warranty issues.

I’m planning on puttin an Extreme Automatics in my short step with a 427, but that’s going to be a $3000 trans...

https://www.monstertransmission.com/...E#.XAqIV4pMGhA

https://www.jegs.com/i/JEGS/555/6030...SABEgIsN_D_BwE

http://extremeautomatics.com/th2004R.php
__________________
44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
Mike C is offline   Reply With Quote
Old 12-07-2018, 11:50 AM   #9
davischevy
Senior Member

 
davischevy's Avatar
 
Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,780
Re: New Transmission

I put an overdrive in anything I am going to drive. I have accumulated a collection of good 400 turbos.

A reputable transmission shop can build a 200r for that HP.
__________________
other Larry


Build thread, Arkansas K10
https://67-72chevytrucks.com/vboard/...=755797&page=5





The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.
davischevy is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:32 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com