Rebuilding 55-50, 09G, TF80 and TF81 Linear Solenoids
The linear solenoids on the Aisin valve bodies control line pressure, shift pressure, shift/engagement feel and lockup control. A linear solenoid that is sticking can cause all sorts of problems depending on the solenoid and the transmission type. The linear solenoids need to be rebuilt as much as the valve bodies do on these transmissions. The pintles stick and the outer shell (can or shell) can become distorted or loose.
Adjusting Clutch-Control Valves on the Aisin FWD 6-Speeds
Have you ever installed a TF80, TF81 or TF60 after overhaul and it has had harsh shifts or engagements, or maybe there has been a flare/bump upshift or harsh coast-down clunks? Most times, clearing the shift adapts and driving the vehicle to relearn the shifts will correct these annoying problems. After a good, long test drive to relearn the shift adapts, sometimes a shifting or engagement problem remains. Assuming that there is not excessive wear in the valve body and the linear solenoids are good, the clutch-control valves on the valve body can be adjusted to correct these problems.
