Failure to engage gears

2003 LEXUS RX 300
300,000 MILES • 3.0L • V6 • 4WD • AUTOMATIC
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VILLAGEHEADMAN ZAKEYO
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Had faulty reverse cylinder, which I replaced. After replacing vehicle move about 500 meters, then fails to engage gears, it sounds like is in neutral mode, yet is on drive.

Mechanic told me, forward cylinder, need to be replaced. I bought new one. But the car still can be driven 500 meters then fails to engage gears.

I was told I need to replace Norsal body, I bought new one but the car still move about 500 meters then fails to engage gears.

Am confused, I need help , what can be a problem?

So far , I have bought:
Reverse cylinder.
Forward cylinder.
Norsal body.
Still my car can move about 500 meters then fails to engage gears.

What should I do??
Apr 19, 2021 at 8:14 AM
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KASEKENNY
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Just to be clear, the vehicle will move 500 meters after each of these repairs one time and then will not move any more? Or will it move 500 meters after sitting for a while?

This sounds like a possible fluid issue or the pump is failing. Basically the way this works is the pump builds pressure in the unit in order to apply the clutches which moves the vehicle.

The other possible cause of this is a leak from a seal inside the unit.

We need to start with testing the pressure inside the unit and go from there. I attached the process below from the manual.
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Apr 20, 2021 at 4:49 PM