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Yes, a vacuum modulator can cause a Turbo 400 transmission to slip in 2nd gear if it is malfunctioning or not properly adjusted. The vacuum modulator controls the pressure in the transmission, and if it fails, it may not provide the necessary pressure for the clutches to engage fully. This can result in slipping during shifting or under load. It's important to diagnose the issue accurately, as slipping can also be caused by other factors, such as low fluid levels or worn components.
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Where is the vacuum modulator on a 1995 Chevy Silverado?
If your speaking of the vacuum modulator for the transmission, they no longer use them on the transmissions with overdrive and electronics. The powerglide, turbo 350 and turbo 400 used to use them.
Can you run a vacuum pump to the vacuum modulator on a 350 turbo transmission?
No because this will not be the proper signal from manifold vacuum that tells the transmission what kind of throttle position and load the engine is under.
How do you tell a turbo 400 from a 350 turbo?
The TH 400 has the vacuum modulator attached to the passenger side of transmission.The TH 350 has the vacuum modulator attached to the rear of transmission.The transmission oil pan on the TH 400 is anything but square.
How do you tell a turbo 350 transmission from a turbo 400?
The TH 400 has the vacuum modulator attached to the passenger side of transmission.The TH 350 has the vacuum modulator attached to the rear of transmission.The transmission oil pan on the TH 400 is anything but square.
How do you adjust a 350 trany?
There is no adjustments to a 350 Turbo Transmission (GM). The only external thing that would cause shift problems is the vacuum modulator on the side. This is replaceable easily. Check for proper vacuum signal to the modulator. Make sure there are no holes and or kinks in the vacuum line from the engine to the modulator. If none is found, replace the modulator for shift complaints. If it is slipping, the tranmission will require removal and overhaul. This transmission uses wet clutch plates and automatically compensates for wear in the plates to a certain point.
Where do you run the vacuum line from the turbo 400 trans modulator to an edelbrock performer 800cfm carb?
When you get ready to run the vacuum line from the turbo 400 trans modulator to an Edlebrock Performer 800 CFM carb, attach the vacuum line for the transmission vacuum modulator to the bottom constant vacuum source or the plug that is below the throttle plate. After that, install the vacuum advance to the port that is signaled or right above the throttle plate. Once that is completed, install the large vacuum line to the back of the carb for the power brake.
1980 turbo 350 shifts into drive too soon?
Check the vacuum source to the vacuum modulator. If it's good, try a new modulator.
Why does your turbo 350 transmission come out of 3rd gear when above 60mph and under load it seems to go to 2nd gear but if you don't rev rpm's up enough it just coasts?
make sure the fluid is full and the vacuum line is connected to the vacuum modulator on the back of the transmission, also you could install a new vacuum modulator that might cure the problem, have you changed the transmission filter? it could be getting plugged.
Which way do you turn the screw on modulator valve On a 350 turbo trans to make it shift quicker on low vacuum?
the modulator valve does not have a screw, however, the modulator located outside the modulator valve may or may not have one.
1980 Chevy turbo 350 transmission will not go in gear?
pour some transmission fluid in the dipstick hole 2 litres will do it. you may have a leak, any evidense of red fliud at the vacuum pipe that connects the modulator valve to inlet maifold, at manifold end, if so change modulator (externally mounted on tranny)
How do you remove the modulator on a 1967 Chevy truck?
Assuming this is a PowerGlide or Turbo-350 automatic transmission vacuum modulator, to minimize fluid loss jack up the rear of the truck and support with suitable jack stands, place a drip pan under the modulator, pull off the vacuum line from the modulator, remove the small bolt and clamp holding the modulator in place, gently twist and pull the modulator out taking care not to lose the small actuator pin inside. Keep the dirt from entering the opening. Install the new modulator with a new o-ring.
Does a 1988 grand wagoneer have a transmission vacuum module?
No it does not. It uses a Chrysler 727 automatic that uses a shift modulator rod that comes down from the carburator. The 70's vintage fullsize Jeeps use a GM Turbo 400 that had a vacuum module...
