Nothing wrong with the trans. You need to run a diagnostic test on it to find our what codes come up so you'll know what sensor is bad.
SOURCE: Car moves backwards in "Park"
can be that the cable for your shifter lever needs to be adjusted in the engine bay on the transmission itself. it may be that when you shift it into park the lever doesn't reach far into the park position hence would still be in reverse and then when it bucks thats when the time it slips into park.
SOURCE: oil mixing with coolant
If this is a 3800, Upper Intake Plenum or Lower intake gaskets are an inevitability. Head gaskets on these engines rarely go out! Seriously, don't get duped. I am doing the job on my grand prix right now. Google it for further explanation.
SOURCE: rx300 with 143000 miles, overdrive won't engage
Start by checking the least expensive items: Make sure you are not activating the O/D switch in the shift stick inadvertently. Look at the display panel, if the "Eng" light is on, you must get the code and repair the affected item. If you have knock sensors and/or oxygen sensors malfunctions that may prevent the transmission from shifting to O/D. Check the ground cables located in the engine compartment, especially the ones behind the air intake manifold. If they are loose or broken it affects the ECU (car computer) and causes the transmission to work erratically. If they become disconnected it may burn the ECU and shut down the car. Now going to more profound mechanics, it could be a sticking shift solenoid valve, your RX300 transmission have five of those located were the transmission oil strainer (filter) is. It can also be an ECU malfunction and/or related to the wiring from the ECU to the transmission connectors. Always start from the least expensive and recheck the obvious. Good luck.
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