I used the wd lithium spray on everything seems to have stopped all the noises coming from the rear of my ute. Also changed diff oil which stopped the most noise.
I had similar thing in my ba and ended up being the coil packs. Had new plugs installed and re gapped would drive fine till you got up it then was like fuel was cutting out. Dont know if this helps
Its not the actuator its that the little turbo cant hold that boost all the way they just fall over. You need the gtx version they hold boost and can easily see 360+ rwkw
Remove wheel then remove the two bolts holding the caliper on the stub axle. Rotor will fall off pretty easy job just dont let the caliper hang and stretch and break the lines.
I ran the xyzs in my vy ute and they were better than the pedders coilovers in my ba xr6 turbo. Didnt think it was worth running coilovers with a leaf spring rear end this time around.