I'm almost there converting my 2004 LeSabre to GXP suspension. Have some questions and a few issues though.
Rear shocks are in, front struts in. Sway bars waiting in the wings.
The front struts were built using parts from a 50k mile GXP, with the exception of the dust boots, and the strut cartridges, which were new GM parts.
I built both up, and the driver side has been fine. The passenger side has been giving me a lot of trouble though. I busted the original upper strut bearing after a couple 100 miles, and replaced with a new one (Monroe brand, from Advance Auto). Now, not even a week later, I can hear the spring turning on the upper spring seat. I haven't heard peep out of the other side, and all of this has been in for about a week and 1/2 now. The original passenger upper lasted a week before it completely failed. I've probably put 500 miles on the suspension since it went in.
Have any of you with the swap, or with a GXP replaced the upper strut bearing mounts? With what brand? I'm getting tired of rebuilding this thing. And the other side hasn't made so much as a squeak, and it has the original 50k mile upper.
And any advice on swapping out the front sway bar? I have new end links for it, but the FSM calls for pulling the exhaust, pulling the left tie rod end, and twisting it out that side. Is that the only way?
As far as the rear bar, mine didn't even have one to start with. (FE1). Anyone have a ball park size on the bolts for the bar to chassis mounts?