Automatic Transmission 2-Speed thru 10-Speed GM Autos | Converters | Shift Kits
Sponsored by:
Sponsored by:

TH400 tailshaft seal local availability?

Thread Tools
 
Search this Thread
 
Old May 16, 2019 | 10:29 AM
  #1  
JoeNova's Avatar
Thread Starter
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default TH400 tailshaft seal local availability?

I have an issue with my TH400.

Fresh trans. I go to slide my driveshaft in and it won't fit into the tailshaft housing, the seal has too small of an inner diameter and the yoke just butts up against it.
The place that did the trans gave me a part number, I picked it up locally and went to slide it over the driveshaft to check. Same problem.
Turns out its for a torqueflite. They claim the seal in the trans came from the TH400 rebuild kit used on the transmission and not the torqueflite one.

Now I need a seal ASAP. I can always order one online and get it in a few days, but I need the car driving by Saturday morning.
Select parts stores in the area seem to keep this type of thing in stock, but I need a part number or even a link for whatever brand those stores might carry.

Can anyone help?
Reply
Old May 16, 2019 | 11:09 AM
  #2  
squarles67's Avatar
TECH Regular
10 Year Member
Photogenic
Photoriffic
Shutterbug
 
Joined: Jun 2013
Posts: 487
Likes: 6
From: Orange, Texas
Default

try AC Delco 9949 (should be 9449)

Or go to the local parts store and ask for the seal for a 1975 1 ton pickup with a 454 and automatic

Last edited by squarles67; May 16, 2019 at 02:00 PM.
Reply
Old May 16, 2019 | 11:53 AM
  #3  
JoeNova's Avatar
Thread Starter
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

Is that supposed to be 9449? That's the one I'm going to grab after work today.
Reply
Old May 16, 2019 | 01:55 PM
  #4  
squarles67's Avatar
TECH Regular
10 Year Member
Photogenic
Photoriffic
Shutterbug
 
Joined: Jun 2013
Posts: 487
Likes: 6
From: Orange, Texas
Default

Originally Posted by JoeNova
Is that supposed to be 9449? That's the one I'm going to grab after work today.
That's what Rock Auto says for several I looked up that would have a Turbo 400, sorry for the typo in the first response. Dyslexia can be a bitch when it comes to part numbers
Reply
Old May 17, 2019 | 08:09 AM
  #5  
JoeNova's Avatar
Thread Starter
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

Didn't help. I bought 2 other part numbers and while they fit the yoke, they didn't fit the trans.

Turns out I have a rare 65-67 tailshaft housing that uses a small bore gasket and bushing and a very thin yoke.
It also has an oiling hole in the housing that fills the rear with fluid right behind the seal.

Swapped out housings. No more chasing my tail. Problem solved.
Reply
Old May 17, 2019 | 12:38 PM
  #6  
squarles67's Avatar
TECH Regular
10 Year Member
Photogenic
Photoriffic
Shutterbug
 
Joined: Jun 2013
Posts: 487
Likes: 6
From: Orange, Texas
Default

See if you can get some $$ for that tailshaft housing from restorers, Turbo 400 in those years would've been very rare. Basically big block chevy in cars
Reply




All times are GMT -5. The time now is 12:16 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE