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

TH400 swap help

Thread Tools
 
Search this Thread
 
Old May 27, 2007 | 08:15 PM
  #1  
general23cmp's Avatar
Thread Starter
Launching!
iTrader: (1)
 
Joined: Mar 2005
Posts: 205
Likes: 3
Default TH400 swap help

Ok, I understand the computer issues with my swap, and I also understand that there is an adapter (spacer) required to adapt the LS engine to an older style torque converter and transmission. The adapter goes on at the axis of the crank.

Here's my questions:

1. Does this adpater move the flexplate out, and if so, how does the starter engage? If not, does the spacer move the torque converter out, so there would be more spacers required where the torque converter is attached to the flywheel? I am just having trouble picturing how all this goes together...

2. I have read that 5.3L and 6.0L flywheels have the correct bolt holes without any modification for the torque converter. Is this true, and if so, are these interchangable on all LS engines (LS1, LS2, etc.)? I've never liked the idea of "ovaling out holes" which I have read is required if using an LS1 flexplate.

Thanks guys,
Reply
Old May 27, 2007 | 08:35 PM
  #2  
FLT's Avatar
FLT
FormerVendor
iTrader: (1)
 
Joined: Sep 2005
Posts: 6,620
Likes: 4
From: Wood Dale, Illinois
Default

The spacer goes between the flex plate and the torque converter. It allows for short style pilot converters to be used.
Reply
Old May 27, 2007 | 09:04 PM
  #3  
general23cmp's Avatar
Thread Starter
Launching!
iTrader: (1)
 
Joined: Mar 2005
Posts: 205
Likes: 3
Default

If it goes between, then there would be spacers between the torque converter and the flexplate where the bolts go, right? When you say short-style, that is the same as the older style, right?
Reply
Old May 27, 2007 | 10:23 PM
  #4  
jay_lt4's Avatar
10 Second Club
iTrader: (4)
 
Joined: Oct 2006
Posts: 855
Likes: 0
From: wisconsin
Default

https://ls1tech.com/forums/automatic-transmission/639693-ls1-style-engines-old-style-trans-th350-400-2004r-700r4-4l60e.html
Reply
Old May 27, 2007 | 10:37 PM
  #5  
general23cmp's Avatar
Thread Starter
Launching!
iTrader: (1)
 
Joined: Mar 2005
Posts: 205
Likes: 3
Default

Thanks for the link. That's actually where my questions originated from. It never says anything about shims or spacers being required where the torque converter bolts to the flywheel. I think it'd have to have them if it is spaced out from the flywheel with the spacer. The spacer is at the axis of the crank.

Also, it states that the 6.0L flywheel, the spacer goes on between the flywheel and the crank, so how does the starter engage? Can any of these flywheels be interchanged?
Reply
Old May 27, 2007 | 11:41 PM
  #6  
FLT's Avatar
FLT
FormerVendor
iTrader: (1)
 
Joined: Sep 2005
Posts: 6,620
Likes: 4
From: Wood Dale, Illinois
Default

You should not need any spacers between the flex plate to converter pads. And yes I was referring to the earlier converters with the short pilot.
Reply




All times are GMT -5. The time now is 03:45 AM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
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-4
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-5
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-6
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-7
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-8
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-9
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