trans won't engage--shop says valve body problem

[jayarbee]

2000 RX300 AWD transmission ceased engagement in forward and reverse. When started cold I could get it to move a little. Repair shop says "the valve body won't hold pressure". I have noticed other posts suggesting cleaning the filter might help get some more miles out of the car. The car is not worth the price of a rebuilt transmission but if I can coax a little more life out of it by a simple cleaning I will. I really like the car but for the price of a rebuilt trans I can upgrade to a newer model.

[Lexus Owners Club]

I would definitely try a filter and fluid change to see if that makes the difference.
I'm sure it will but chances are that the box will never be the same as it was owing to being starved off fluid and pressures won't hold as high

But definitely worth trying it as not too expensive to find out one way or another.