I had to ask cuz the variable damping shocks ride rougher with age. At least, the bi-state ones do. The suspension controller is a part of, if not
the reason for this. My point is that, in my experience, the Belltech struts and shocks ride about the same as the "worn/firmer" OEM struts and shocks. Maybe a little more compliant, but definitely not Cadillac quality. They're a decent compromise between sporty handling and highway cushiness, IMO. Supposedly, Bilstein 4600 series are the bee's nuts in satisfying most driving conditions. But, they're pricey and not "lowering" struts, requiring other measures for lowering.
For the front, definitely start with spindles. AFAIK, they all yield a solid 2" drop except for McGaughy's, they yield 1.75". I have the McG's and, after being surprised and aggravated about the lesser drop, I'm now at peace with and appreciative of it since learning why. They have some particulars about their installation, though. For the hassle and lesser drop, and since BT now has a second design spindle to address ball joint angles for +2" drops, I'd probably go with BT if I were to do it again. For the rest of the drop, you can get adjustable struts. Or, if you wanna use good struts, such as the Bilsteins, that are not drop struts, you can mount them under the control arms with special grade hardware (Grade 9). This way would give you an adjustable drop that won't require you to disassemble the strut to add or remove spacer rings. While you have it all apart, I'd suggest installing the BT alignment cams just to ensure you have enough adjustment for the 4" front drop. This requires elongating the slots in the upper control arm mounts. A die grinder with a rotary hasp will work fine.
For the rear, do your research on coils as there are plenty of viable options ranging from those from BT specifically for this platform to drop coils for a Trailblazer to using "whatever fits". I have Jeep TJ coils for my 4.5" rear drop. You'll need ~2-3" shorter shocks and extenders. The go-to are the BT SP (Street Performance), which complements the SP shock used in their strut. I'm running Bilstein 4600s from a Jeep XJ. They have the exact same dimensions as the BT drop shocks, but required modification to mount.
What you need to determine is the type of ride quality you're wanting and/or willing to accept and how much you wanna spend to make it a "one-and-done" and/or a "buy once, cry once" ordeal.
My drop stuff starts here if you want details and pics:
https://www.tahoeyukonforum.com/threads/growing-up-doesnt-have-to-suck.93510/post-1394964
