your correct the spring doesn't have the same force throughout its travel,and in theory increasing the preload will make it stiffer. However the bilsteins are designed for the lift and the ride is actually better than stock. The linear rate springs make it easier to deal with the preload vs progressive springs. THe other big pluss is the stock suspension travel is maintained with the height adjustable shocks vs spacers.
Finally got the rear blocks in The rear blocks are from the previous generation trucks (they are ~1.2" and I milled them down to 1").New U bolts from a 2018 are perfect length. Top pics it without the blocks , bottom with.
Finally got the 1" blocks in the rear. I got the stocks blocks from the previous generation truck They are 1.2" and I milled them down to 1" used the stock bolts from the pervious truck too and they are the right length. A local shop gave me the blocks out of their scrap pile and the U bolts were ~$8 each.
Had them set at the 2" height . its the 2nd to highest. the highest setting is 2.5" but is not recommended with stock control arms. at the 2" setting the ball joints are not at an extreme angle, in fact its hard to tell any difference from the stock angle. The 2" setting was a true 2" lift on my truck (I measured before and after with stock tires and it was exactly 2")
I used the 5100's set at +2" to the front of my 2022. increased the tires size from 275-60/20 to 275-65/20. Tires are an inch taller at 34" vs stock 33" The combo raised the front 2.5" and the rear 0.5". Truck is perfectly level. The Body style for the 2019-2022 makes it look a little front high sometimes so I'm adding 1" rear blocks this week to give it just a little rake. No other leveling kit was added (i.e. spacers) I think the shocks are the way to go for leveling and there is no need tor spacers unless you want to go higher. The pic is how it currently sits with out the rear blocks.
I'm on 34's (275/65R20), Stocks are 33" (275/60R20) The Height is 2.5 Inches taller than stock. 2 Inch from the suspension and 1/2 Inch from the tires. In the picture there is no lift in the rear other then the tires. It almost exactly level but sometime it looks nose high because of the Silverado front fender body lines. I have some 1.2" rear blocks from the previous gen trucks that I'm going to install just to level it out to the eye a little more. I parked next to a trail boss the other day and the front of my truck is about 1/2 taller, the rear is about 2" lower as the Trail Boss has a pretty big rake.
Nothing extreme but I did a 2" lift with Bilstein 5100's and Nitto 34" Tall 275/65R20 w stock wheels on my 22 refreshed Silverado LT 2.7L. Nitto is the only 34" tire you can get in non Light Truck load and it only weights 4 lbs more than stock LT tires are all 13-18 lbs heaver each and its that unsprung weight that really kills MPG. Fuel economy was not effected in my case and I looks way better than Stock IMO. RIdes better too.
No ETA yet. Seems like would be a priority. The truck was sold with a safety feature that is known to be defective, worse than if it was never there in the first place. Same Back-order with NO ETA. I sure GM would get a "COVID" pass like in any court.
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