4L60E Transgo Vacuum Modulator - Third Generation F-Body Message Boards

Transmissions and Drivetrain Need help with your trans? Problems with your axle?

4L60E Transgo Vacuum Modulator

Thread Tools Search this Thread
Old 06-03-2007, 11:37 AM   #1
Supreme Member
Thread Starter
iTrader: (2)
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 7,961
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears

4L60E Transgo Vacuum Modulator

I know this is not exactly Thirdgen related (My 1997 Express), but lets say one of our readers has a LT1/LSx swap with a 4L60E in a thirdgen. I have found the line pressure in typical OE applications of the 4L60E to be annoyingly low. Even after a shift correction kit by Superior, it still shifts too soft. I ran across a Vacuum modulator kit for a 4L60E made by Transgo. They claim it works great in Heavy Duty and performance applications. Any truth to this. Basically they replace the Electronic Pressure Control solenoid with a vacuum modulator. With no vacuum the line pressure is 230-250 PSI, when vacuum is applied the pressure is reduced. The highest I have seen an OEM line pressure setting at with a 4L60E is 180-190 PSI. My 700r4 in my 1983 runs at 275 PSI @ full TV extension. I love the way it shifts, crisp, almost instant shifts.


Fast355 is offline   Reply With Quote
Old 03-02-2011, 05:30 PM   #2
Supreme Member
iTrader: (1)
Join Date: Jan 2002
Location: garage
Posts: 4,431
Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E

Re: 4L60E Transgo Vacuum Modulator

You can increase the line pressure in the PCM calibration.
junkcltr is offline   Reply With Quote
Old 03-02-2011, 10:54 PM   #3
Supreme Member
Join Date: Jul 1999
Location: Calimesa, California, U.S.
Posts: 3,272

Re: 4L60E Transgo Vacuum Modulator

The PCM cannot change the WOT pressures, just part throttle. Yes, the TransGo vacuum modulator can raise line pressure quickly. I have used them in the past successfully in certain situations, as they offer very quick downshifts. The best WOT pressures in forward gears in the 700R4's or 4L60E's is apx. 230 - 240psi., any more than this starts to get hard on the gear train splines. There are always exceptions, but this works very well from what I & other builders have seen over the years.
Pro Built Automatics is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Using GM drac instead of SGI-5 box? InfernalVortex Electronics 9 12-22-2016 01:56 PM
1990 Camaro RS Stalling issues at Red Lights.... HoosierinWA Tech / General Engine 5 10-07-2015 11:15 AM
tpi swap, fuel system questions dusterbd TPI 0 09-29-2015 09:40 AM
92 firebird v6 cruise control help needed tattmann Electronics 1 09-27-2015 06:20 PM
Blowby pressure problem at WOT - how to solve and keep the PCV system ? Pac J Tech / General Engine 0 09-25-2015 06:38 AM

Go Back   Third Generation F-Body Message Boards >

4l60, 4l60e, electronic, kit, line, located, low, modulator, problems, replace, trans, transgo, transmission, vacume, vacuum

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off

Featured Sponsors
Vendor Directory

1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92

All times are GMT -5. The time now is 02:08 PM.

All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: