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HELP! Vacuum Modulation Install

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Old Feb 26, 2005 | 09:39 PM
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Default HELP! Vacuum Modulation Install

Ok so I bought a built 4l60e and it has vacuum modulation, now heres question: how do you hook up the line and what needs to be done?

TIA
Chris
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Old Feb 26, 2005 | 09:50 PM
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i have never seen a 4l60e with a vacuum port
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Old Feb 26, 2005 | 10:31 PM
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It T's in the Brake Booster Line. The "T" should have came with the vacuum modulator.
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Old Feb 26, 2005 | 10:31 PM
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T off of the power brake line and hook your transmission line to it. The vacume modulaton for a 4l60 comes from transgo.
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Old Feb 26, 2005 | 11:21 PM
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what does it do
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Old Feb 27, 2005 | 12:36 PM
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Originally Posted by 1998TA__1991RS
what does it do
It controls line pressure based on vacuum, instead of the pcm.

What do you set the pressures to, and how do you set it.
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Old Feb 27, 2005 | 02:15 PM
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Originally Posted by 1998TA__1991RS
what does it do
It is supposed to bypass the electronic pressure controls to give you quicker pressure rise
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Old Feb 28, 2005 | 06:59 PM
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do you have any links and/or more info on this
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Old Feb 28, 2005 | 09:42 PM
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Originally Posted by gen 3 bu
do you have any links and/or more info on this
Search ... there are many threads on this.
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Old Mar 1, 2005 | 12:05 AM
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The EPC solenoid (force motor) has a preset of about 170-180 psi of main line pressure at WOT in the "D" position. When using the Trans-Go modulator, and the Trans-Go main boost valve, and you install the modulator pin "as is" (no grinding), it will put out about 220-235 psi at WOT in the "D" position. This can give you a much longer 3-4 clutch life. It also allows for a much faster downshift than its computer controlled couterpart.
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