T-400 shifting too quick - 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 12-11-2012, 08:07 PM
sscanrun's Avatar
Registered User
 
Last photo:
Join Date: Feb 2009
Location: Atlanta, Ga
Posts: 39
Wiki Edits: 0

Thanks: 11
Thanked 0 Times in 0 Posts
T-400 shifting too quick

I have a big block and I just got a th400 built and have a 2600-2800 stall, gear 3:90 and a single plane intake. Its a street/strip car but the car see more of the street than the track

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 12-11-2012, 08:09 PM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 57
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 90 Times in 85 Posts
Quote:
Originally Posted by sscanrun View Post
I have a big block and I just got a th400 built and have a 2600-2800 stall, gear 3:90 and a single plane intake. Its a street/strip car but the car see more of the street than the track


Vacuum modulator connected to MANIFOLD vacuum?
Reply With Quote Quick reply to this message
The Following User Says Thank You to 66GMC For This Useful Post:
sscanrun (12-11-2012)
  #3 (permalink)  
Old 12-11-2012, 08:15 PM
sscanrun's Avatar
Registered User
 
Last photo:
Join Date: Feb 2009
Location: Atlanta, Ga
Posts: 39
Wiki Edits: 0

Thanks: 11
Thanked 0 Times in 0 Posts
66GMC - the carb
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 12-11-2012, 08:28 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
Some Modulators are adjustable, small screw inside tube where Hose connects. It will give a small 3-5mph range.
For more adjustment you'll need a Governor Recalibration Kit.
B&M Governor Recalibration Kits 20248 - SummitRacing.com
Modulator needs Full Manifold Vac, not Ported/Timed Vac source.
Reply With Quote Quick reply to this message
The Following User Says Thank You to SSedan64 For This Useful Post:
sscanrun (12-11-2012)
  #5 (permalink)  
Old 12-11-2012, 08:35 PM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 57
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 90 Times in 85 Posts
Quote:
Originally Posted by SSedan64 View Post
Some Modulators are adjustable, small screw inside tube where Hose connects. It will give a small 3-5mph range.
For more adjustment you'll need a Governor Recalibration Kit.
B&M Governor Recalibration Kits 20248 - SummitRacing.com
Modulator needs Full Manifold Vac, not Ported/Timed Vac source.
Yup ... I'd start with connecting the vacuum line directly to MANIFOLD vacuum.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 12-11-2012, 08:46 PM
sscanrun's Avatar
Registered User
 
Last photo:
Join Date: Feb 2009
Location: Atlanta, Ga
Posts: 39
Wiki Edits: 0

Thanks: 11
Thanked 0 Times in 0 Posts
Ssedan64 -will try
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 12-11-2012, 08:50 PM
sscanrun's Avatar
Registered User
 
Last photo:
Join Date: Feb 2009
Location: Atlanta, Ga
Posts: 39
Wiki Edits: 0

Thanks: 11
Thanked 0 Times in 0 Posts
I have to drill a hole on the single plane intake. That means I have to remove it?
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 12-11-2012, 09:13 PM
stea's Avatar
Member
 
Last photo:
Join Date: Feb 2003
Location: utah
Posts: 336
Wiki Edits: 0

Thanks: 7
Thanked 5 Times in 5 Posts
I recently did the governor mod on my th 350. Im all smiles now. Regular part throttle shifts with full throttle 5500 rpm shifts. It actually gets in to an rpm range the cam likes.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 12-11-2012, 11:09 PM
Bye Jerks
 
Last photo:
Join Date: Nov 2012
Location: nowhere
Posts: 101
Wiki Edits: 0

Thanks: 0
Thanked 9 Times in 6 Posts
Yup, you need the governor recalibration kit. Easy to do, but you basically have to guess the springs and weights, then test drive it.
Took me 4 tries to nail mine down.
Reply With Quote Quick reply to this message
The Following User Says Thank You to 632Mantis For This Useful Post:
sscanrun (12-12-2012)
  #10 (permalink)  
Old 12-11-2012, 11:35 PM
stea's Avatar
Member
 
Last photo:
Join Date: Feb 2003
Location: utah
Posts: 336
Wiki Edits: 0

Thanks: 7
Thanked 5 Times in 5 Posts
I was lucky, got it first try. Used stock springs and IIRC I went 4 grams total lighter on the weights. The original weights that were on the governor were a lot lighter than i expected.
Reply With Quote Quick reply to this message
The Following User Says Thank You to stea For This Useful Post:
sscanrun (12-12-2012)
  #11 (permalink)  
Old 12-12-2012, 07:52 AM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 57
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 90 Times in 85 Posts
Quote:
Originally Posted by sscanrun View Post
I have to drill a hole on the single plane intake. That means I have to remove it?
Really? There are NO provisions on that intake?
There is usually one on the rear face of the manifold, below the carb mounting flange. If not, that's where I would CAREFULLY drill and tap a 1/8" NPT hole for a small vacuum hose-barb.

You may be able to do this by simply removing the carb and taping off the intake runners to prevent any material getting away on you. Drill and tap the hole, and then vacuum up the debris.

Use extreme care when tightening any pipe thread fittings on an aluminum intake, as the the thread is tapered and can crack the intake if over-tightened.
Reply With Quote Quick reply to this message
The Following User Says Thank You to 66GMC For This Useful Post:
sscanrun (12-12-2012)
  #12 (permalink)  
Old 12-12-2012, 04:03 PM
sscanrun's Avatar
Registered User
 
Last photo:
Join Date: Feb 2009
Location: Atlanta, Ga
Posts: 39
Wiki Edits: 0

Thanks: 11
Thanked 0 Times in 0 Posts
Its a single plane not the dual plane
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 12-12-2012, 04:37 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by sscanrun View Post
I have to drill a hole on the single plane intake. That means I have to remove it?
Not necessarily. "Manifold" vacuum only means a full-time vacuum source that is there even at idle. "Ported" vacuum is NOT there at idle, and that's the main difference between the two (there are subtle differences besides that, but they do not apply here).

So you can use a carb port that has manifold vacuum just as easily as using a vacuum port that's in the intake manifold itself, if you follow me.

If you have a Holley, the metering block has a ported vacuum port- do not use that. You can use a port that's located on the baseplate, but still double check to see that it has full vacuum at idle.

An Edelbrock carb has a manifold vacuum port on the front, driver side.
Reply With Quote Quick reply to this message
The Following User Says Thank You to cobalt327 For This Useful Post:
sscanrun (12-12-2012)
  #14 (permalink)  
Old 12-12-2012, 06:23 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by sscanrun View Post
I'm using the one on the metering block
That is the wrong place to get vacuum for the modulator. Use a full time port from the baseplate.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 12-12-2012, 07:37 PM
sscanrun's Avatar
Registered User
 
Last photo:
Join Date: Feb 2009
Location: Atlanta, Ga
Posts: 39
Wiki Edits: 0

Thanks: 11
Thanked 0 Times in 0 Posts
Cobalt327- thanks ima try that tomorrow
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
turbo 400 not shifting truckboy61 Transmission - Rearend 13 09-14-2009 08:00 PM
400 shifting problem Jeff L88 Transmission - Rearend 7 10-10-2005 04:13 PM
TH-400 Shifting novatech Transmission - Rearend 1 07-31-2005 12:52 PM
Auto shifting to quick! chevelle327 Transmission - Rearend 6 11-25-2002 06:57 AM
Turbo 400 not shifting soon enough Mike Phillips Transmission - Rearend 2 10-09-2002 07:43 PM


All times are GMT -6. The time now is 08:37 AM.


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.