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

Thinking of converting to a TH400 from a T56.....thoughts???

Thread Tools
 
Search this Thread
 
Old Apr 23, 2008 | 12:44 PM
  #1  
White.Lightning's Avatar
Thread Starter
TECH Addict
iTrader: (53)
 
Joined: Mar 2005
Posts: 2,863
Likes: 1
From: Aston, PA
Default Thinking of converting to a TH400 from a T56.....thoughts???

Hey all,
Well I've researched a TH400 swap till my eyes hurt. I am thinking of doing the swap soon. I just wanted to hear how people liked/disliked their conversion. My goal with the car is a "badass street/strip car". It will be getting a procharger d1sc, 9", all supporting mods. Looking to make in the 700-800 rwhp range. Reason for the swap is I don't want to be messing with clutches with that much power. So let me hear your post-swap results.

The other option is a 4L80, trans brake, RMVB

Thanks
Andy

Last edited by White.Lightning; Apr 23, 2008 at 01:26 PM.
Reply
Old Apr 23, 2008 | 12:57 PM
  #2  
Frans96SS's Avatar
Banned
iTrader: (15)
 
Joined: Oct 2003
Posts: 3,004
Likes: 3
From: New Castle Del.
Default

Like i said before... you will hate the th400 on the street... i swapped mine instead of my 6 speed and im goin back....
Reply
Old Apr 23, 2008 | 01:25 PM
  #3  
White.Lightning's Avatar
Thread Starter
TECH Addict
iTrader: (53)
 
Joined: Mar 2005
Posts: 2,863
Likes: 1
From: Aston, PA
Default

How about a 4L80 then, RMVB w/ trans brake?
Reply
Old Apr 23, 2008 | 01:57 PM
  #4  
brianatfum's Avatar
Registered User
 
Joined: Apr 2008
Posts: 17
Likes: 0
Default

I dont think you'll hate it. Maybe if you use the freeway often. What's your daily commute like?
Reply
Old Apr 23, 2008 | 01:59 PM
  #5  
LS1Silverado05's Avatar
TECH Addict
20 Year Member
Photogenic
Photoriffic
Liked
iTrader: (41)
 
Joined: Jun 2005
Posts: 2,366
Likes: 1
From: Classified
Default

4L80E will be the most streetable choice...
TH400 will be great if you car is heavy on the strip side of street/strip..

I can understand the swap to the Auto. I did an M6 swap and I am back to an auto. Not worth the hassle of clutches etc in my opinion.
Reply
Old Apr 23, 2008 | 02:12 PM
  #6  
MDoe8's Avatar
Launching!
iTrader: (3)
 
Joined: Jun 2005
Posts: 263
Likes: 1
From: Eureka, MO
Default

It's all about proper gearing and tire selection. A th400 is just fine if you have stockish gears or if you have an exstra set of tall tires for your hwy commute. If you know you're going to be driving on the hwy, put some tall tires on there and it'll lower the rpms greatly. The th400 will definitely be faster. No question though, the best all around performance/commuting transmission would be the 4l80e. Very strong and has overdrive to boot
Reply
Old Apr 23, 2008 | 02:12 PM
  #7  
White.Lightning's Avatar
Thread Starter
TECH Addict
iTrader: (53)
 
Joined: Mar 2005
Posts: 2,863
Likes: 1
From: Aston, PA
Default

My daily commute isn't a concern because I have a company truck. I drive the car 2-3 times a week
Reply
Old Apr 23, 2008 | 02:14 PM
  #8  
MDoe8's Avatar
Launching!
iTrader: (3)
 
Joined: Jun 2005
Posts: 263
Likes: 1
From: Eureka, MO
Default

Also, I forgot to mention. If you have 800rwhp, you probably won't have super short gearing anyway...
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-1

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-2

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-3

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-4

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-5

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-6

10 Camaros You Should Never Buy

 
story-7

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
story-8

Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

 Brett Foote
story-9

10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

 Verdad Gallardo
Old Apr 24, 2008 | 07:33 AM
  #9  
BLNLS1/RX7's Avatar
TECH Fanatic
iTrader: (2)
 
Joined: Sep 2006
Posts: 1,225
Likes: 1
From: Fishers,IN.
Default

Do it.I switched over the winter and took 1.5 sec. off my time.The car can still be driven on the street but not as much fun as the 6 speed was.
Reply
Old Apr 25, 2008 | 04:18 AM
  #10  
revtime's Avatar
TECH Resident
iTrader: (1)
 
Joined: Apr 2006
Posts: 819
Likes: 0
From: OMG I'm in Kansas
Default

Originally Posted by White.Lightning
My daily commute isn't a concern because I have a company truck. I drive the car 2-3 times a week
If thats the case then save the money an 80E will cost you and go with the TH400.
The only time I would advise against the TH400 is if your going to drive your car alot, if you do it can get annoying.
I swapped from a 60E/stock 10 bolt to a TH400/Strange 12 bolt and shaved 4 tenths off my ET.
Reply
Old Apr 25, 2008 | 05:22 AM
  #11  
White.Lightning's Avatar
Thread Starter
TECH Addict
iTrader: (53)
 
Joined: Mar 2005
Posts: 2,863
Likes: 1
From: Aston, PA
Default

I think I am going to hold off on the whole auto swap until the car becomes a drag car. Right now I don't have the money to convert it so I am going to put a crutch on the T56 and work with that for now.
Reply
Old Jul 19, 2008 | 09:31 PM
  #12  
1fast97gsx's Avatar
On The Tree
 
Joined: Mar 2006
Posts: 118
Likes: 0
Default

Originally Posted by BLNLS1/RX7
Do it.I switched over the winter and took 1.5 sec. off my time.The car can still be driven on the street but not as much fun as the 6 speed was.
Kinda bringing this thread back, but I'm just curious as to how that is possible? I did the swap a while back and my car got slower. ( I went to 28" tires as well which messed wit hthe gearing though )
Reply
Old Mar 3, 2020 | 02:10 AM
  #13  
Kj Grimmett's Avatar
Registered User
 
Joined: Mar 2020
Posts: 2
Likes: 0
Default Trying to make auto conversion on my gen1 ctsv

Will a th400 fit in my 05 ctsv without banging out the tunnell or maybe i can a little? Email me grimmettkj@gmail.com i cant figure out how to message ppl on here
Reply




All times are GMT -5. The time now is 10:58 AM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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-7
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
story-8
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

The world was a better place when it was still around.

By Brett Foote | 2026-01-23 09:20:37


VIEW MORE
story-9
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

Slideshow: The 7.0-liter LS7 was designed for absolute cutting-edge performance.

By Verdad Gallardo | 2026-01-07 18:36:00


VIEW MORE