4Runner 2nd generation AT no reverse

4 runner 2nd generation AT no reverse

 

Hello I recently changed the two shift solenoids in my a340e. Everything was fine after I changed them so I drove around then came home and parked. Wake up the next day and it wouldn't go in reverse (worked directly after replacing the solenoids). It also drives while in neutral. I do some investigating and can't even see the level of the tranny fluid on the dip stick so I had to add a full quart of fluid on top of the 1.7 that I already added back in after the job.

My theory: Something welded together in the Tranny due to low fluid.

My hope: Its something small I can fix myself.

Thanks for any input!