rear end rattle

[gstdsmeclipse]

99 gsx eclipse
bought the car little over 200 miles after buying it the driveshaft bolts to the rear diff came out and the driveshaft started bouncing around. towed it home ended up putting on a new to me driveshaft and it makes this rattling in the rear end when your at a steady speed or if im doing 40 in 5th gear and I hit the gas. I thought the diff got messed up so I rebuild the diff same noise I put in aluminum bushings same noise. then I put a new to me diff in and the same noise is there. also I eliminated anything but the diff and driveshaft because I put it up on jacks pulled both halfshafts out and ran It up to 3k rpm anyideas would be great thanks

 

[noobin it]

Check the universal joints on the driveshaft for slop/play. With the car on stands, leave it in gear (or park) and try rotating the driveshaft with your hand while watching the front u-joint. Then pull the e-brake, put it in neutral and check the rear. There should be no play or slop in either.

 

[962ndgen]

99 gsx eclipse
bought the car little over 200 miles after buying it the driveshaft bolts to the rear diff came out and the driveshaft started bouncing around. towed it home ended up putting on a new to me driveshaft and it makes this rattling in the rear end when your at a steady speed or if im doing 40 in 5th gear and I hit the gas. I thought the diff got messed up so I rebuild the diff same noise I put in aluminum bushings same noise. then I put a new to me diff in and the same noise is there. also I eliminated anything but the diff and driveshaft because I put it up on jacks pulled both halfshafts out and ran It up to 3k rpm anyideas would be great thanks

Check to make sure your subframe support/mount is all tight if not the motor and trans can move about 11/2-2" around and could give u that "sloppy" noise your hearing also check the ujoints as mentioned other then that your T-Case could have something to do with it

GL!!