Can someone point me to the thread dealing with adjustments to the rear shock mount or linkage to raise or lower the stance of the rear of the car? I couldn't find it.

Would this cause any significant weight shift to the front tires for more traction at launch? Any other consideratons / concerns?

I have a tow hitch installed and wondered if this extra weight should be offset somehow (the air leveler probably takes care of this).

The car is at the shop right now, clunking at rear passenger being looked at. Could be just the common shock mount problem but while they are under there...may get new shocks too -- 145,000 miles on originals. Anyone have recommedations on replacement shocks? Monroes will probably do but is there a specific performance model available? (I don't foresee towing anything heavy like a boat etc).

Not 100% on your year. However on the 92-99'* with ELC, the adjustment is a little rod on the passenger side rear suspension. According to my FSM, ~5% can be made up or down. As for the tow hitch.. it shouldn't change the height sensor position.

Thanks,

5% ? Is that even noticeable? Why would one even bother? An why do you think they designed this adjustment feature? Any idea?

I'm sorry.it'* 5 degrees.

Being that GM measures it in front of the rear wheel ... and your pivot is your front tires..5 degrees is quite a bit.

Oh Ok, that makes sense.

Just curious if you happen to know the reason behind this design of allowing the height to be adjusted. Strictly for "looks"? Or does it shift more weight and hence traction to the front wheels.

Sorry for all the questions. The shop is going to call me soon with their findings and I will have to make the call on whether I have them adjust this.

I could get almost 4" of additional rise (measured top of tire to wheelwell) in the rear doing the level sensor trick on my '98 LeSabre, but I stopped at about 2". I looked under the '04 and it looks like it would adjust the same exact way.

It does look cooler, but I did it mainly so I wouldn't bottom out so much on the poorly designed driveways everyone has around here on their postage-stamp-sized lots.

I don't know whether it really "stiffens" the rear on a launch any...some say it does, but I'm not convinced. I don't see how it would shift the weight ratio...maybe if you filled the bags with helium

On our Bonne'* the rod is in the rear drivers side wheel well towards the front of the rear tire.
It is not adjustable.
To raise the rear simply pull the rod off and the spring tension of the sensor will default to the raised position.
It helps to push the trunk button first to jack the car up in order to more easily access the rod.

The most you will get is an increase in height from 29" to 31.5" measured from the ground to the wheel arch lip.

Yes it does help to both stiffen up the rear to prevent squat, improves weight transfer for better launching.