Sounds like the trans fluid pressure is set too high. There should be some type of adjustment for that. Either mechanical like on the older allisons...
You can use a small hammer and screwdriver or blunt chisel to loosen them sometimes. If you can get in there with a large pair of channel locks that...
I have not separated the two but I do know there is a larger catch screen on the solenoid pack. You will want to drop that down and check there also....
When you start the truck, hwy should flash until there is around 100psi in the tanks. At which time a pressure switch closes and the system should do...
I dont have one on hand right now but its a standard 2 wire isuzu actuator. You can call drash and get the manual. Just need the serial number. Drash...
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