The only thing you did not mention was the possibility of "shock crush" on full compression. The stock setup at 1.5" of lift the are at the verge of crushing the shock and PRG now adds a taller bump stop to many of their 1.5" lifts where as before they only did so at 2". An extended travel shock is longer and will crush sooner than a stock length shock. I do believe there is a slight difference between the OEM yellow bilstein (10.55' compressed length) and the black OEM shock (~10.25), and that is why many of the ebay lift state "will not work w/ Nismo/pro4x" as they do not supply a taller bump stop.I noticed that after i installed the King shocks my truck still looked like it had just tad too much rake. First I thought about dialing in 1/2" of lift but I was wary of preloading the springs too much and altering the comfy ride. I came across 1/2" lift spacers from PRG so I ordered up a pair. When they arrived they just sat in my garage until I had a chance to put them in last week.
The machined spacers are actually only 1/4" thick, but from what I understand the suspension geometry of my truck has a 2:1 ratio, so that 1/4" at the shock end equates to 1/2" at the wheel end. Before installing I had to round up some hardware. The King shocks use bolts to attach to the coil bucket up top, so I went to the local hardware store and picked up new grade-8 hardware that were all 1/4" longer than the original King hardware to compensate for the added spacer thickness. After raising the front end on jack stands, I elected to unbolt the uniball on the UCAs to give me enough room to squeeze the spacer in without having to unbolt the bottom of the shock.
New lift spacers and grade-8 hardware.
Top of the king shock unbolted.
Spacer in position on top of the King shock.
For a moment I was a little worried because the spacer had a larger outside diameter than the King shock top hat, but it turned out that the spacer fit perfectly flush underneath the coil bucket area.
You can see here that the spacer is a perfect fit.
From the outside view you can’t even see the spacer.
As noted in my Suspension Down Travel Notes (02.10.16) post, I already had 2-5/8" of suspension down travel. With the spacers installed the suspension down travel amount didn't change - which makes complete sense since I did not alter the shock length in any way. However, the lower control arm was now extended an extra 1/2” lower than before. Combined with the extended King shocks there was concern that the suspension would be too extended and that the lower spring perch would contact the front axle driveshaft. With everything torqued down and in place, I double-checked the clearance and found that there was still a lot of clearance:
At only 1/2" of lift you probably don't have anything to worry about. But at 1" I would think contact could be made.
This isn't something that is very easy to check either, as you need to remove the spring from the coil over install in the shock back in the truck and compress the suspension.
Here is a picture of my OEM shocks with a 2" spacer, OEM bump stop suspension compressed by a floor jack.
Though initially it appeared that I had a tiny bit of space, testing with a zip tie one the shaft showed that it was not. The zip to got blown off as the shock crushed it. I installed the taller bump stop supplied by PRG and I am no longer "crushing".