will a lx thunderbird tranny work in a 90 supercoupe automatic?

Work? Probably

How long? Long enough to get you down the block.

Seriously, look for one from an SC. They are built stronger to hold the torque of the Supe Coupe.
 
Check the fluid and check the TV cable.

Don't believe the AOD has any sensors, atleast that I recall.

If the fluid level is good and TV cable is set right, then my guess is you have other problems and it may be time for a rebuild. But that's just my guess :)
 
Check the grommet first, I wouldn't waste my time on a standard v6 transmission on a 90 model, they were hard enough to keep together using the best unit available which was the sc.
Alan
 
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