T-400 torque converter questions - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 02-10-2011, 05:30 PM
Supporter of the 4.3 liter V6
 
Last photo:
Join Date: Dec 2010
Location: The Villages, Florida
Age: 21
Posts: 132
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
T-400 torque converter questions

I am looking at torque converters for the THM400 transmission, and am wondering if any of you chevy guys have put a locking type converter in your tranny, or do they make locking types for that transmission? B&M has a wide selection of torque converters but none say if they are locking or not? has anyone installed one of these and know whether they are locking or not??

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-10-2011, 05:49 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 9,227
Wiki Edits: 0

Thanks: 26
Thanked 423 Times in 387 Posts
The TH-400 transmission never had a lock-up feature, that I know of. The trans has to be a lock-up type to use a lock-up converter.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-10-2011, 09:11 PM
Registered User
 
Last photo:
Join Date: Feb 2011
Location: msp
Posts: 13
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
400: no. 350:yes.

The TH350C was a lockup TC/tranny combo. But there never was a lockup 400.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-10-2011, 09:52 PM
SSedan64's Avatar
Registered User
 
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
I think Chris at CKPerformance was talking about doing Lockup TH400's on the TurboBuick.com Forum. It's been a while can't remember what ever happened. These would be Custom as none came factory w/Lockup.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 02-11-2011, 10:39 AM
Supporter of the 4.3 liter V6
 
Last photo:
Join Date: Dec 2010
Location: The Villages, Florida
Age: 21
Posts: 132
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
So there are no aftermarket torque converters that i can get for this transmission that lock up?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 02-11-2011, 12:21 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 9,227
Wiki Edits: 0

Thanks: 26
Thanked 423 Times in 387 Posts
Quote:
Originally Posted by ChadGresham
So there are no aftermarket torque converters that i can get for this transmission that lock up?
That is correct, because this transmission is not designed for a lock-up converter. There would be no provision in the valve body, case, or input shaft for the hydraulic lock-up fluid path.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 02-13-2011, 01:47 PM
Supporter of the 4.3 liter V6
 
Last photo:
Join Date: Dec 2010
Location: The Villages, Florida
Age: 21
Posts: 132
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Ok thanks, i figured that but i had my hopes kinda high in consideration of gas mileage.. Has anyone ever swapped a thm400 for a 700r4? including the display on the dash for p,r,n,d... i wonder if that would be very hard to do?
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 02-13-2011, 03:50 PM
1ownerT's Avatar
Home School Valedictorian
 
Last wiki edit: Health and safety in the shop or garage Last photo:
Join Date: Dec 2004
Location: Iowa
Age: 53
Posts: 1,645
Wiki Edits: 4

Thanks: 0
Thanked 3 Times in 3 Posts
A lock up converter is only going to net a couple hundred rpm's, not enough to make any real difference in mileage especially considering the cost vs mpg gain.
A 700r4 could be swapped but depending on the application you may be giving up a stronger trans.
Depending on the vehicle there are some companies that make replacement shift indicator displays.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 02-15-2011, 04:55 PM
Supporter of the 4.3 liter V6
 
Last photo:
Join Date: Dec 2010
Location: The Villages, Florida
Age: 21
Posts: 132
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
That is true, i know that the 400 is the toughest one available for a 1986 truck. I bought a new torque converter seal which was my main problem, just a small trans fluid leak, and a new torque converter as well just in case the old one was slipping and causing bad gas mileage.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 02-15-2011, 05:20 PM
Registered User
 
Join Date: Feb 2011
Location: Sacramento
Posts: 26
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Hi,

Yes. There is a "switch pitch" converter that came in TH-400s in Buicks, etc. in the 1970s. Likely hard to find.

Good luck,

Matt
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Torque Converter to Flexplate Torque Spec. Needed - 2004R Zeeb Transmission - Rearend 1 05-26-2010 06:47 AM
B&M Torkmaster 2400 rpm stall converter vs. stock torque converter??? zbhover Transmission - Rearend 2 11-02-2008 07:52 PM
torque converter install questions dawg Transmission - Rearend 5 03-21-2008 05:13 PM
Torque Converter Transmission match up questions MissJohnDeereGreen Transmission - Rearend 1 05-22-2007 10:08 PM
Headers & torque converter Questions Mustangsaly Engine 19 09-27-2006 07:39 PM


All times are GMT -6. The time now is 11:41 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.