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I am sorry for the long wait
once it stops working no reverse and no drive gears at all ?
are there any codes set in the computer at all ?
with the design of these transmissions by default no matter what happens with the computer or wiring or even shift solenoids it should always have a forward gear as long as the fluid is full
i am sorry to say there is an internal failure going on inside this transmission of usually the forward clutch assembly
have the pan removed and check for debris and to be sure the filter/strainer is not plugged up if it is not the transmission needs to be removed and replaced or rebuilt
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then the issue has to be the forward clutch or also called the one way clutch internally not holding when it gets warm
the transmission needs to be removed and taken apart or replaced next
how are you making out ?