This sounds like the lockup solenoid needs inspection or replacement.
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Funny you mention that. That same day I had issues with my trans.
Just driving and just starting to stop pulling. Pulled over and finally just wouldn't do anything at all, just rev.
Trans was 130degrees, checked for a line blown off. Put it manual 1st, reverse, nothing.
Turned it off, made some calls. Turned it back on, put in drive and it engaged, pulled out a bit and about 30sec later, same thing.
Finally got it home, and a friend suggested to try the filter before I go too far.
Changed the filter, just a little dust in the pan, nothing bad. Drove it, it drove perfect! Shifting every gear, lockup, overdrive, everything.
Only for about 10min. Then it just lost overdrive.
Stopped started again, it'll shift every gear and lockup, but will not even attempt to go into overdrive.
Hooked up the laptop to monitor it through the anteater, It does call for overdrive, but never feel it attempt overdrive.
Guys think it could be the solenoid/transducer and/or the lockup solenoid? I was just going to do gov pressure solenoid and transducer today. But now you mention the lockup solenoid too, has me wondering.