i just got my tranny fluid changed and my right axle replaced/// today i was on a hill so the car barely move when not given gas...and when i do give a little bit of gas...i hear and feel this clicking movement from the shifter...i have an auto by the way..what could this be...when i go back to leveled roads...the problem is gone..thanks

 

Take it back to the shop and have them check everything out. on THEIR money. they shouldn't charge you for it because they evidently didn't do the job right. you're not responsible for their mistakes.