Having a little shudder on my trans like vibration when it locks up and constant unlock and locking of TCC on highway.

My fluid is perfect red and not Burnt so I think I might have a small solenoid issue. I can put it in SS and floor it in all gears and no slippage hot or cold and uphill too.

Since the 5AT has no tcc solenoid like 4AT, what controls lockup?

 

It does have a TCC solenoid valve. The TCC solenoid valve and Pressure Control solenoid C controls the TC lockup.

28400-P6H-013 TCC solenoid valve. This is located on top of the TC. There are two solenoids. The TCC is the rear most.

28250-P7W-003 Pressure C solenoid - This has a filter, you might want to check for debris on this solenoid first before replacing.

 

Haven't had time to do a cleaning yet. But over the last 1500 miles it has not gotten any better or worse. After about 7 miles or so into my drive it acts normally except the stutter that always happens in 3rd gear right between 1700 rpms and 2000 rpms.

Is is it possible the pressure switch is failing?

Switches were changed around 200k miles and car has 236k now.

Also found out it is an updated post 05 trans(replaced in 2006 According to dealership records) which has almost 140k miles on it.

Fluid is still red and smells fresh just like it normally would