Transmission issues? Can anyone help?

[Kevin V]

About 7 months ago i bought my supra. Its a 1988 non turbo 3.0L, i bought it naive knowing it had transmission issues, so i didnt test drive it. My issue is that the transmission slips between 2nd and 3rd. When i first bought it i flushed the tranny and it was fine for about 1 weeks when it suddenly slipped. I got it to shift and went to take it home, and the tranny basically shut off. It acted as tho it was in park the rpm gauge would climb but it wouldnt move. I shut off the car in a parking lot and much to my dismay turned it back on cause i had no option but t drive it home. It did not slip again so i deduced it maybe electronic. I brought it into a tranny shop and they found the speed sensor to be bad so that was replaced. I took it out and drove it about 50 miles and it slipped again. The overdrive off light never completely turns off even when it is engaged it just flashes at me, does anyone know what might be causing this?

[btwilson86]

IIRC, the O/D light flashing represents a stored trouble code in the Auto trans computer. I can't remember how to check for that code, but I'm pretty sure it's done in a similar way to checking for a engine malfunction code....

Ok, check here to read your trans code. Found this in the online TSRM

[Kevin V]

That would make sense, my only issue is i just had the speed sensor replaced, is that saying that its another electrical part thats shot still?

[btwilson86]

From the very brief reading I was doing on the online TSRM, it seems the malfunction codes for the most part only represent electrical issues with the no. 1 and no. 2 solenoids, so it appears that it would be pointing to a different electrical issue than the speed sensor. It would be my guess that it's a malfunctioning no. 2 solenoid, but you definitely need to pull the stored code(s) before doing anything else. That way you can start working on the known problem(s).