Hello I need some help here.. I've got a 2005 cadillac srx all wheel drive.. I have been having a rumbling/grinding noise in the rear end of the car.. Its not constant it happens between 45-60mph.. I cant seem to narrow it down.. Now here's the bad part this is a list of all the things I replaced Drive shafts, rear differential, rear differential bushings and cv shafts.. I've done the test for the rear wheel hubs but I dont have any play in the wheels.. I'm close to pulling my hair out here anybody else run across this problem and or have any other ideas?

 

Could be 2 things either a bearing or your tires. Check the wear on your tires. Run your hand on the tread and see if the tire feels choppy. As for a bearing noise does it change when you go around right or left corners?

 

The tires have even tread and it does not make the sound when turning corners.. The sound occurs when traveling in a straight line and only between 45-60 mph.. I thought a bearing was going but I tried doing the wheel shaking to see if there was any play in the wheels but there isnt any.. Basically I've replace everything on the drive train I dont want to do the hubs at 286 a pop to find out its not the problem! There would be a mushroom cloud present on the eastern sea board if the sound continued after that

 

Sometimes you will not get any movement from a bad hub. You have to also spin the wheel and listen for a noise or get the car up on a lift put it drive and have some one listen for a noise.