Last few days were in the 30-to 40's allowing the snow to melt but it only got up to about 7 today and it was like -4 over night. Today i noticed a pop noise coming from the rear of my jeep and i got under to check and i didn't seen to have any play in my driveshaft so i don't think it is u joint's could this just be any of the bushings being frozen from all the water from driving in water and it getting really cold before it could dry out everything? Has anybody experienced this. It happends when i hit bumps and go from reverse to drive and also on a hard take off.

 

My XJ gets noisy underneath when it's really cold outside as well...especially after going through a car wash then sitting overnight.