What would cause a Turbo 350 transmission not to shift?
If the transmission has enough fluid, the vacuum modulator could be defective, the modulator’s valve may be sticking, or the oil strainer may be plugged or leaking. If the problem persists, the forward, intermediate and direct clutch plates may be slipping.
How do you adjust the vacuum modulator on a Turbo 350?
You can adjust the modulator with a small screwdriver. Turn the adjustment screw clockwise to raise shift points and counter-clockwise to lower shift points.
How do you know when your torque converter is going bad?
When the torque converter starts malfunctioning, you may feel shuddering and even slipping in overdrive. You usually notice your car shuddering because it feels like it’s vibrating. Your car will vibrate even when you’re not going very fast. The shuddering makes the car lag and is very noticeable.
What causes a transmission problem on a GM Turbo 350?
If you look at the list below, it quickly becomes evident that many problems can share a common cause, such as the transmission being low on fluid, or the gear shift selector not moving the manual valve correctly. The TH350 has one advantage over a TH400 in that the filter is attached to…
Where can I get a GM Turbo 350?
This Tech Tip is From the Full Book, GM TURBO 350 TRANSMISSIONS: HOW TO REBUILD AND MODIFY. For a comprehensive guide on this entire subject you can visit this link: SHARE THIS ARTICLE: Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in.
When to remove the valve body on a GM Turbo 350?
The most difficult problems when it comes to transmission function involve the valve body (control valve assembly). In almost all cases the valve body must be removed to correct any issues, and this should be done after all other possibilities have been eliminated.
Is the TH350 transmission easy to troubleshoot?
The TH350 is a rugged and durable unit, and fairly simple in construction and operation as far as automatic transmissions are concerned. If you have correctly assembled the unit, and it passed the air checks to the clutch drums through the openings in the case during assembly, any issues should be relatively easy to diagnose and repair.