I'm not completely sure what it could be but I know there are shift solenoids to control the shifts. As far as not having any forward gears it could be a bad range sensor. That's the one on top the linkage goes through. it moves a checkball that controls fluid flow to certain parts so you only have however many forward gears you want. It almost sounds like the transaxle is fried. It may also be as simple as the fluid level is too low, which is a possibility as these cars don't have a dipstick. You have to check it by taking that bolt out in the passenger side extension housing with the car running and see if fluid runs out. Really need a transmission expert on this one. I'm just thinking of ideas. Hard to diagnose without actually having the car in front of me. Good luck.
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