1992 Lexus ES 300 transmission sluggish

I just got the car aligned and had the rack and pinion bushings replaced and the tie rods and the swaybar bushings replaced. The day after I got th car back from the shop the tranny went out on a hill. When the accelorator is depressed the engine revs and the car hardly moves forward. I notices that the OD/off light started to Blink which is not normal. I check the fluid level and it looked fine. Also when the tranny is shifted into REV it grabs hard.

What could the problem be? Could it be a sensor cable that came loose or a vacume hose or do I need a new tranny?

Thank you, 1992 ES300 SJPR