modulator valve th350 - Hot Rod Forum : Hotrodders Bulletin Board -- 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
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 02-12-2007, 04:47 AM
Registered User
Join Date: Nov 2005
Location: missouri
Posts: 14
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
modulator valve th350

i have an early 80s 350-350 the trans will not shift into third. night before was fine the next morning no shift. how do you check mod. thanx

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 02-12-2007, 05:28 AM
Last photo:
Join Date: Aug 2005
Location: Yackandandah.Australia.
Age: 54
Posts: 641
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Hook up a mighty vac (vacuum pump) to the mod and pump it to 20 inches, if it holds this for 10 minutes then the diaphragm is ok. If your mod is adjustable, use a depth gauge to check the plunger position and set it to match a non adjustable one.
If it only drops into 3rd when you lift off it could be 2/3 shift valve, stuck modulator valve (not mod itself) or governor,governor valve.
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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
th350 in 67 Tempest csob Transmission - Rearend 1 02-19-2006 10:45 AM
TH350 wont do anything - a few questions justchris Transmission - Rearend 2 02-15-2006 12:56 PM
T-350 to 700r4 swap? trumick Transmission - Rearend 6 09-23-2005 09:19 PM
TH350 to M21 or TH350 to 700R4 thecamaroguy Transmission - Rearend 6 02-10-2005 02:18 PM
Swapping a Muncie m465 to a TH350 TL-Iguana Transmission - Rearend 2 12-26-2003 11:32 AM

All times are GMT -6. The time now is 12:33 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright 1999 - 2012. All Rights Reserved.