I decided on changing the transmission yet again since the Lexus mechanics tested all the wiring and it was giving the proper readings so they thought it had to be mechanical . After installing the 3rd transmission it is having the same exact issue. This is driving everyone crazy!!!!!!!
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Take a look at this company.
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Lexus LX 470 new ECU need to be programmed before installing it? saw an article on the internet that there are companies that program it with your VIN .
Have the carfax for the 2004 lx 470 from the 1st owner that own it almost all the way till the accident with all the maintenance records. The second owner owned it just a few months and he wrecked it. Fluids were topped at the correct temp at a Lexus dealership.
When I start driving as engine revs up it engages in a slower gear as speed increases it stays on that gear until it gets to 4th gear and then 5th. When it gets to 4th and 5th it’s going at the proper speed.
I Installed a low mileage transmission on my 2004 lx 470 it won’t go into 1st and 2nd gear. checked all the wiring and solenoid and all test ok. Guess the only thing left to check is the ECU. If it’s ok the used transmission needs to be the issue. What do you think?