when i hit or drive into even the lowest drive way i aalways here a very loud thunk on the back passenger side. i tried pushing the back down to see for any give but i can't tell if its the strut. any ideas of what it could be

 

Very little information here. Check your endlinks.

 

Two things you should check first.

1. Get down and check the rear passenger shock. Make sure there is no sign of oil leakage. Also make sure the spring is still in good shape in the event that it cracked.

2. Double check the torque on the endlinks. Stock endlinks and sways have a decent amount of slack, and the slightest loosening will start making crazy clunking noises. This is always audible at lower speeds.

(bah...J beat me to #2 lol)