****** part is, I have not been able to figure out exactly how much to lower the nut for a desired right height. Nobody can seem to give me a rough idea. So I guess it will be a trial and error thing... lower it a little, reinstall shock/tires and see what it looks like... then repeat if necessary till I find the desired ride height.[/QUOTE]
I think you're making a good decision going to the wall mounted coil compressor. When I spoke with Fox months ago they told me that's what needed to be done. That the threads could be ruined if trying to use a wrench or other methods.
If you are looking for the 1.5-2" Front ride height increase, I suggest starting at 1/4" or 0.25" decrease on the Fox threads. ALSO, mark the thread where you started (stock/out of the box) and then the thread where you end. If the Fox shocks act similar to mine, I think the 1/4" will get you to an actual decrease of around 1/2" or 0.5" decrease to stock, maybe more. Hopefully you'll end up somewhere around 1.5 - 1.75" ride height increase from original measurements.
There is also a "Ride Height Trim Procedure" that goes along with any GM Suspension work. As per my friends at Xineering.com (manufacturers of GM Shock Sims):
"It is a function used by the GM Dealerships scan tool to re-calibrate the suspension control module for any changes in ride height or ride height sensors to set the 'zero' ride height position of the vehicle.
It reads the ride height sensor voltages, stores them in memory, and sets them as the normal ride height position
The Suspension Control Module (SCM) is calibrated from the factory for its stock ride based on the ride height sensor voltages. This is the stock 'zero' suspension travel position for the magneride system.
As the vehicle drives (moves up/down, side to side) an algorithm determines how much electrical current (mA) to send to each magneride shock in order to maintain a smooth ride. The amount of current sent to a shock is proportional to how hard or soft the control module wants the shock to dampen.
If the ride height of the vehicle changes, due to a shock or spring replacement
OR If any ride height sensors have been replaced
A ride height trim calibration procedure is necessary, to re-zero the system."
Apologies for the slow response - family vacation, headaches and work catch up - Disney. Need I say more?