transmission on 1994 Buick Regal

drove it to work today about 30 miles,left stop sign and up in overdrive,then the tranny slipped. made a stop and was able to drive the car up to 10 mph.then it would slip again no reverse had to milk it home another 30miles in 1st. gear, fluid is full but smells burnt.need help.

Asked by for the 1994 Buick Regal
How is the fluid level while the engine idles in park and the car is on a level surface?