I get a thumping , almost like I have a flat tire when i accelerate going up hill. on 2002 BMW 325xi

when I accelerate in drive going up hill. I get a thumping sound, like a flat tire would make.it goes away if i let up on the gas. it happens when im doing around 55 to 60. what could it possibly be

Asked by for the 2002 BMW 325xi
2 answers
Check the drive shaft
Check the passenger side CV Joint or axle, they can be replaced for under $100.00