I own a 2015 Yukon XL Denali which I know is the LWB compared to your Tahoe, but I have the same MRC suspension. I too wanted to lower my vehicle, improve the stance, reduce the wheel gap, and level it out more / reduce the rake from front to rear. All while maintaining and preserving the ride quality to remain as much as factory OEM.
From what you've described what you're wanting to do is absolutely possible and I don't think you'll have to drop the rear as much as 3" to accomplish what you're after.
The lowering parts I used were essentially from NORCAL SS but some purchased from forum members on here.
I purchased the Belltech '15 - '20 Front 2" Drop Spindles from NORCAL SS:
Using drop spindles in the front offers the ability to lower the front while maintaining the same suspension ride geometry with spring and front strut travel. Now if you search around on the forum here regarding the use of drop spindles in the front on the '15 - '20 K2XX platform you'll learn how not everyone gets a full 2" drop out of the spindles (See measurements below). This is primarily due to GM using various springs for the front during production; I believe there are at least 3 different front spring part numbers used on our K2XX SUV platform resulting in different levels of drop across different trucks using the same drop spindles.
Then I purchased the '15 - '20 Rear 1-4.5 Adjustable Kit here:
https://store.tbssowners.com/index.php?act=viewProd&productId=578
I also purchased and installed low profile rear bump stops and performed the rear free travel mod.
I also purchased and installed the rear DJM relocating sway bar end links.
I probably didn't HAVE to do the rear free travel mod, but it seemed easy enough while we did the install anyway and I'm partial to doing things right and being "over preventative". So the piece of mind knowing I was adding additional rear travel clearance rather it was needed or not vs. finding out later I should have done it while we had the rear suspension off and in pieces anyway was worth it.
So to
@Big Mama point I essentially peicemealed my own 2" Front / 1.5-4" Rear Lowering Kit, similar to what's linked above from Belltech and at NORCAL SS's online store here:
https://store.tbssowners.com/index.php?act=viewProd&productId=609
Here are my before and after measurements:
*With OEM 22" wheels and 285/45/22 tires Front ride height measureing from ground to fender lip measuring vertical up through center of wheel (center cap)
STOCK FRONT = 35-1/4"
LOWERED FRONT = 34"
I only got 1-1/4" drop up front out of the Belltech 2" Drop Spindles.
STOCK REAR = 37-1/4"
LOWERED REAR = 34-5/8"
Dropped the rear 2-5/8" resulting in a 5/8" rake from front to rear.
It's a cold crappy rainy day here in Ohio, so excuse the filthy truck but here's a pic of what that ride height looks like right now:
View attachment 359139
I also measured my wheel gap since that was what you're after or using as a point of reference for how much you wanted to drop your Tahoe and I have about a 3" wheel gap (+/- 1/8") both front and rear.
Front Wheel Gap:
View attachment 359140
Rear Wheel Gap:
View attachment 359141
I've kept and maintained factory GM OEM MRC shocks and struts front and rear and my XL Denali rides like OEM+. I eventually added Hotchkis front and rear sway bars and I couldn't be happier with how it rides and handles.
Let me know if you have any questions, hope this helps.
Happy Modding.
