I installed new axles and wheel bearings and ever since then the z bounces a lot in the rear and shakes a lot. It did throw a slip warning once while driving straight. I am a bit confused because I lifted the rear end and drove in first and i can see the dif and passenger axle bouncing up and down. I tested with the axles disconnected and the diff does not bounce at all. however when rear is in air with axles disconnected or connected I always get a slip light once rpms are above about 1500 rpms I give it gas and it shakes and cuts power and throws the slip light. I was wondering what this could be because I don't think it should be slipping with car in the air.

 

That's very odd. Are your ABS sensors at the diff output shafts installed and connected up? Any damage to them? What type of axles & bearings did you use? Some pictures of the installation would help. There shouldn't be any bouncing unless the axles are binding and or damaged.
Cheers!
-Icer

 

I believe the sensor are fine I used a scanner and they seem to be outputting okay the rears match when going in a straight line. I installed trakmotive axles off rockauto and Hayaku wheel bearings from z1. Ill try to take some pictures later.

 

Can you share pictures?

 

 

Just a thought, but did you compare the lengths of the new axles with the originals? One is supposed to be longer than the other. I believe the shorter axle is on the driver's side and the longer one is passenger side. Just making sure you didn't get two axles that are equal length or their positions reversed.
-Icer

 

yea I checked axles i believe the driver side was longer so i just put the similar length one in. I just took everything apart again and found that one of the new wheel bearings i put in already had play. I put in an old wheel bearing that still didnt have play and retested with car in air and still slipping. I have yet to drive it though im not sure if the bouncing is gone.

 

I double checked some photos I have from when I swapped my diff and re-painted my axles. The driver's side (left side) should have the shorter axle and the passenger side (right side) should have the longer axle. Assuming the axles and bearings are correct, then it might be that you have a problem with the Diff. What trim level is your Z?

Edit: Have you fully torqued your axle nuts down yet? You mentioned you haven't driven the car, so you could have play from the nuts not being torqued, best practice is to do this with wheels on the ground (center caps removed) if your e-brake can't handle it.

-Icer

 

yes i torqued to 177 ft lbs with car in air with the ebrake.i drove it and still feels like its hopping its an enthusiast so maybe the vlsd is going out

 

possible the axles arent true.. might be a slight bend