Okay, one step at a time. The lash has become less. I replaced my diff the second time by a refurbished one. It was the original diff but all the bearings replaced and the torsen reset. The rear end is better, but still a whine.


Listen to the sound on the video. When i float the throttle lightly, there is still al clear whine. When I completely get my foot off the throttle it Is gone, when i give the car throttle to accelerate or maintain speed, its gone. Could this be the rear wheel bearing and hub having play? Today I redid the axle nut to be sure its one the right spec, it was. When I grab the rear wheels with the car in the air i don't feel play. I replaced the gearbox, replaced the prop shaft, diff, rear axles... the car drives me crazy sometimes.

You can hear the whine at 5 seconds, 17 seconds and 44 seconds. I have a small amount of throttle in those situations.

 

Your axles will make that noise if the bearings aren't mated to the cup. They'll eventually mate.

 

And maybe; because the sound was similar with the other set of axles, could the whine be my wheel bearings in the rear? I feel a kind of snaketail when i let of the gas. The sound does not change in corners and cant feel any play when i pull on the wheels on multiple angles. Maybe in need to order new hubs and bearings.

 

Rear end steer with sudden throttle change is caused by rear tires with different diameters. Even the slightest difference in size is enough to be felt. The most common reason is difference in tire pressure.

But unevenly worn tires or even brand new tires from different factories will also cause the issue.