I recently jacked up my car on jackstands and I was running the car 1st through fifth and when I put it in reverse the passenger wheel alone spins and the transmission makes a loud grinding sound, while the driver side wheel stays stationary... I never noticed it when the car was on the ground hmmm any ideas what this could be???

 

That's the differential in action.

 

so that reverse grinding sound is normal? maybe when its on the ground, the suspension/cv joint goes back to normal... anyways thanks man... ur a big help, and ill try to help with what I know also to others and keep this up.. nice forum!!!!!