Hi blueagle,

If you're still having problems with the rear suspension, maybe some of what I experienced may help.

I recently had my left side (both front and rear) go down but not always. The front more so than the rear. Ended up being a leaky front air strut. I replaced both since I'm almost to 60K miles. I had also taken care of other front suspension problems so that it did not make sense to me to not replace both fronts. On the rear, they said they checked all the other three and seemed to hold pressure so they felt that I had no leaks.

Afterward initial replacement of the front struts, I had two issues. One was the X was not level and the other was the left rear still went down sometimes. I think it happened twice in a span of a week.

All four corners were at different heights (differences being from 1/8" to 1/2"). However, weasel said it's common to have slight differences. The shop I use don't have a GT1 and are not experienced with it. So, they allowed me to adjust the ride height in the shop since the X was sitting on its tires. Afterwards, they let me have it for a week to make sure things were all okay. When I returned to the shop for wheel alignment they adjusted the sensors (by adjusting the holder height) to get it even. They did it without telling me prior and I just left it as is.

Later when I got it home, I decided to play around with the GT1 and found some things I had heard about but never investigated further prior. One was you can set the suspension "zero point" through Control Module Functions. This is basically setting the default ride level height.

I had done a write-up about ride level adjustment through Service Functions using the GT1 but now I realize that my understanding of it was incomplete. That way is you measure the existing ride height at each wheel and the GT1 compensates compared to the zero point setting. What I discovered in the Control Module Functions is actually setting the zero point. Basically you adjust the ride height to what you want then push a button to remember that as your default ride height.

The other things I found under Control Module Functions was you can adjust independently the ride heights incrementally up or down. The complete front axle or the rear axle can also be adjusted incrementally at a push of a button. The exact dimension for each increment I don't have yet but its about 3/16" to 1/4".

I experimented with my default ride height (zero point) being lower than stock (as before for me) and higher than stock (like when you adjust for more clearance). I wanted to see if I could feel the handling differences. I currently have it higher than stock because I just haven't had time to play around some more. Probably I'll adjust it lower than stock again but higher than my prior setting.

Since that time, I have not had the rear left go down at all. As a matter of fact, since after the shop adjusted the sensors, I have not had the left rear go down.

I don't know, what if anything, resolved the left rear from going down. I'm just relaying my experience and maybe your shop can glean something. Maybe try setting your default ride height to higher or lower temporarily and see if that changes your results. Maybe adjusting the sensor heights ...

Good luck and would definitely be interested in your findings.