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The Vacuum Modulator is located on the right side on the transmission just above the pan and below the two cooling lines. It should be brass colored with a 1/4" or 3/8" vacuum hose attached to it.

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12y ago

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How do you tell the difference between Chevy automatic transmissions?

Th350 has a modulator on the back. Th400 has modulator on side. 700R4 has no modulator.


How much vacuum pressure is at the modulator valve on a th400 at idle?

same as engine vacuum.


WHere do you hook up the vacuum lines from the modulator on a TH400 automatic transmission?

engine vacuum or direct into the intake.


Does a 1988 Chevy 1500 have a transmission vacuum modulator?

More Info, If You Do Not Find A Modulator, You Could Have a Different Trans. If You Have A Square Pan With 16 Bolts Then You Have A 4L60 or TH700( no modulator on these) If the pan is oval and 17 Bolts Has 4L80 ( no modulator on these) Hope This Helps You Should Have A TH400 Trans & It Does Have A Modulator.


How do you tell the difference between a TH350 and TH400 Trans?

A 350 has a vacuum modulator back at the tailshaft on the passenger side. Also the pan's shape is different.


What controls the shifting on a th400?

The shifting on a TH400 transmission is primarily controlled by a combination of hydraulic pressure, a governor, and a modulator. The governor uses vehicle speed to adjust the pressure, while the modulator responds to throttle position to influence shift points. Additionally, the valve body manages the flow of transmission fluid to engage and disengage different gears based on these inputs. Proper adjustment and maintenance of these components are essential for optimal shifting performance.


How do you adjust the bands on a th400 transmission?

they are not maintenance adjustable on the th400


How do you adjust the bands on a chevy th400?

they are not maintenance adjustable on the th400


Where is the modulator valve located on a 1982 gm Malibu?

on the passenger side in the back of the tranny the vaccum line goes to it.


Will a th400 transmission bolt onto a gm 305 small block?

as long as it is a chevy bolt pattern th400


Is your th400 interchangable with a th700ra transmission?

no


Does a th400 have the same bell housing as 4l60e?

same bolt pattern if the 4l60e was behind a v8 or 4.3and the th400 was from a chevy and not a (bpo or caddy )