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

Need help with TH-400 - will not shift 1 to 2

Thread Tools
 
Search this Thread
 
Old Aug 14, 2004 | 07:32 PM
  #1  
Navy David SS's Avatar
Thread Starter
TECH Veteran
iTrader: (13)
 
Joined: Nov 2001
Posts: 4,647
Likes: 1
From: Sioux Falls, SD
Unhappy Need help with TH-400 - will not shift 1 to 2


First short background. Brand new TransKing TH-400. Reverse pattern, manual valve body, with transbrake. Only 25-30 passes on it. Worked perfected. No problems wants so ever. Took the converter out, re-stalled from 4000 to 4800. Brand new Turbo cheater shifter.

First 5 passes were about perfect. 1st round of elimination, got a new best of 10.56 with 1.42 60'.

On the 2nd round of elimination, I went to shift from 1 to 2 it stayed in 1st, quickly shifted into 3rd. Finished the run. Came to the pits. The SS would not shift from 1st to 2nd. Park, Reverse, 1st and 3rd are all fine. Just no 2nd gear. Took the shifter cable off, still the same, manually shifted from 1st to 2nd, same no change still in 1st.

Everyone said it was just the valve body, and should be an easy fix. Well, took the valve body off, went to the tranny shop, they couldn't find anything wrong with it. NONE of the valve were stuck. Did we get lucky??? Put the valve body back into the SS. Fired it up. Same ****. All gears are perfect. Just will not shift from 1st to 2nd.

No metal shavings, oil was just changed, oil was still clear. Tranny was not over or under filled.

I know its the weekend but really need help ASAP.

Thanks

David
Reply
Old Aug 14, 2004 | 08:10 PM
  #2  
Automatics's Avatar
Restricted User
 
Joined: Apr 2004
Posts: 377
Likes: 0
Default

Something in the 2nd gear sprag assembly could have let go. The transmission will have to taken apart for this.
Reply




All times are GMT -5. The time now is 03:05 PM.

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