My old 2015 used to shake a lot between 70-80. Dealer finally road force balanced wheels/tires and most of the shake disappeared. Fortunately I have had no vibration issues with my new 2018.
I had the Hellwig 7735 on my 2015 Sierra Double Cab 1500 with 2.5" BDS leveling kit, 3" Readylift blocks, and 1.5" Zone body lift with no issues. I have a 2018 GMC Sierra Crew Cab 1500 with a 3.5" Superlift level and the Hellwig 7886 bar as that is what Hellwig recommended and there are no clearance issues. I would contact Hellwig for their recommendation but the 7735 bar might work.
I'm in the metro area but had Lew from Diablew do a tune and am very satisfied. I have heard Livernois Motorsports does pretty good work but do not have any first hand experience with their work/mods.
I had some issues installing one on my 2018 GMC and broke the first one too. My problem was the center plastic stub. I had to trim a bit of the surrounding legs at the base so it would fit. The top metal clip also gave me issues but I discovered it was slightly off when I was trying to press it into place. Once I got it exactly centered, it popped right it. I had installed the driver-side assist in my 2015 GMC and don't recall it being difficult as when installing it on the 2018.
I had a shop install the body lift. It took them about 7hrs. I considered going with the 2" block but I had read the factory blocks are 1.25" so I was worried it would be perfectly level and then when I put something in bed or pull, my nose would be up in the air.
It has ReadyLift 3" rear blocks and ReadyLift shock extensions. Rake is no greater than factory before BDS 2" leveling kit, ZoneOffroad 1.5" body lift, and ReadyLift blocks. My camera angle was off making rake exaggerated. IIRC, the rake is now not quite 2". It still retains the factory 20" rims/tires at this time.
dougwtx replied to Travis Whitmore's topic in 2014-2018 Silverado & Sierra ModsI used 3" ReadyLift rear blocks and their shock extensions on my 2015 double cab. They are tapered and with my 2" leveling kit, it has about 2" rake. I am not sure of the differences in the lower cost ones on eBay but I wanted to stick with well-known brands.
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