Small pieces of dirt or debris are the enemy of the automatic transmission as it is a close-tolerance hydraulic system with quite a few moving parts. The good news as it relates to valve body problems is that the TH350 uses a cast-iron valve body with steel valves, making it rugged and nearly unaffected by over tightening fasteners. 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. The most difficult problems when it comes to transmission function involve the valve body (control valve assembly).
Turbo 350 transmission install#
This still doesn’t mean that the filter can’t plug up and cause issues, but at least you don’t have to worry about an air leak on the suction side of the oil pump because you forgot to install an O-ring or missed a crack in the suction tube. This eliminates the potential for a leak at the suction tube or O-ring in the case. The TH350 has one advantage over a TH400 in that the filter is attached to the bottom of the valve body and already on the bottom of the oil pan. 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. 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.
The TH350 is a rugged and durable unit, and fairly simple in construction and operation as far as automatic transmissions are concerned. You can copy and paste this link to share: įor example, if your transmission doesn’t move the vehicle at all when placed into service after an overhaul, you should check the transmission fluid level before pulling the transmission out to check the oil pump or torque converter. SHARE THIS ARTICLE: Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. For a comprehensive guide on this entire subject you can visit this link: LEARN MORE ABOUT THIS BOOK HERE
Turbo 350 transmission how to#
This Tech Tip is From the Full Book, GM TURBO 350 TRANSMISSIONS: HOW TO REBUILD AND MODIFY. This involves a process of elimination, usually starting from the simple, easy-to-check items, then moving on to more difficult items in logical sequence.
Troubleshooting is the step-by step process where you can logically diagnose a problem.
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