I have Cognito UCAs on my 15 Sierra with Boss Halo coilovers and the stock 20" snowflake wheels. My coilovers are set at 2" and I have a Zone 1.5" body lift. Before I put the Cognitos on I had RC UCAs and had the same issue as you. At that time my front was set to 3", so i think the higher you go, the more it pulls the wheel in. At 2" on the coilovers it does not make contact anywhere. I'm running a LT285/60R20 tire. Sent from my SM-G975U1 using Tapatalk
I'm running BORA 1" spacers with the snowflake wheels and LT285/60R20 Cooper Discoverer AT3 tires. I have the Boss Halo Lift coilovers at 2" and a Zone 1.5" body lift. The wheels will work without trimming the studs. I have a rub when cranked all the way in reverse but it's only the liner. I'm also running Cognito UCAs and there is no contact with them. When you lift the front with a spacer, you are bringing the wheel inward which is the problem you described. Sent from my SM-G975U1 using Tapatalk
I had that happen and I just pressed the bushing into the plate using a large socket and vise. A little lube will make it easier too. If I recall, I forgot to put the washer on top and that's why it popped lose.
This website lists that part number for 2017/2018 Silverados https://www.partsgeek.com/ss/?ssq=13516164&page=1 I would recommend calling a tire shop and asking the question to be sure.
I did sell it. I see them from time to time on this forum. You can also check eBay. I see them quite a bit there too. Sent from my SM-G975U1 using Tapatalk
I’ve punctured 10 ply tires just as much as the other.... in that size, you would be more comfortable with the 4 ply. I run LT285/60R20 and to get a decent ride I run them at 38 psi cold. Really should be running 42 psi based on the conversion table from Toyo Tires but it definitely has an impact on ride quality. As you go bigger, the p-metric options are hard to find. Nitto Terra Graplers G2 come in a 305/55R20 "XL" version which is lighter.
I had RC UCAs on my 15' Sierra with Boss Coilovers at 3". Without wheel spacers, my stock 20" wheels would contact that apex on the front of the arm (metal to metal)... I ended up replacing the arms with Cognito, dropped it back down to 2" and there is no rubbing anywhere.
I've had my soft cover on for almost 5 years and never had an issue with it. Sent from my SM-G975U1 using Tapatalk
Yes, my setup is Cognito UCAs and Boss coilovers. When you level a truck with spacers, you lose down travel because the stock UCAs ball joint is the limiter. By replacing UCAs you gain that down travel back. You don't want to over extend the suspension with aftermarket UCAs because the shock becomes the limiter. Based on your intended use, you shouldn't have to worry about that. You can even get by without replacing the UCAs but your ride will be a little harsh in some circumstances. I'm glad I did the upgrade because my truck rides about as good or better than stock. The stock Ranchos are junk... Sent from my SM-G975U1 using Tapatalk
I've had all three options and the coilovers ride the best. I orginally started out with Bilstien 5100 and a Zone 2" kit with the shocks at stock setting. The ride was ok but always felt like I was hitting a limit on down travel. Next I went with the Eibach Pro Truck lift and found it to be too stiff. I recently installed the Halo Lifts Boss Coilovers. At first I went 3" (shock set at 2" and two spacers under for an additional inch) . I also installed Rough Country UCAs and had 1" BORA spacers. I had vibration problems with the spacers so I took them off. The problem then was that the wheel would contact the UCA. So I took out the two spacers under the strut and installed Cognito UCAs. The ride is really good. My stock wheels & LT285/60R20 tires don't rub anything. If you add up the money I've spent I could have gone with a lift kit.... The Boss Coilovers are worth the money... Sent from my SM-G975U1 using Tapatalk
I found my unlock module that I installed in my truck. It's from PAC, p/n NU-GM51. It allows you to input destination while driving. You activate it by double pressing th rear defrost button and the accept the warning. Sent from my SM-G975U1 using Tapatalk
I put a separate module in mine when I did the upgrade. You may be able to get that programmed in. You also have to replace the radio as part of the I06 upgrade. I went through MVI for mine. The radio and the I06 module are paired as far as i know. I had factory Nav on my I05 and wanted to retain the feature so that was my experience. Sent from my SM-G975U1 using Tapatalk
I'm not sure about the ProComp lift, but others like BDS and Zone push the front wheel out 1 1/2" so most people run a 1 1/2" spacer only on the rear to make them match. Theoretically the spacers should match the OEM lug pattern unless someone put a wheel on that is different. One way to make sure the lug pattern of the current spacers would be put the spare tire on and it matches then you should be ok. Sent from my SM-G975U1 using Tapatalk
Option 1 will leave you with steep CV angles. Also depends on what UCA you choose may or may not require Wheel Spacers with the stock wheels. I ran BORA 1" spacers with my setup when I first installed my Boss Coilovers with RC UCAs. I had vibration issues with the spacers. I even tried it with and without a Differential Drop Kit. The vibration was really bad when you hit the brakes. I tried to run it without the spacers and it did smooth out, but my stock wheels rubbed on the edge of the RC UCAs and limited my steering. I've since dropped the coilovers to 2" and installed a set of Cognito Ball Joint UCAs with no spacers. It rides better and no rubbing. I've also got a Zone 1.5" Body Lift so it is effectively 3.5" higher than stock. I think running that large of a top spacer and the Bilsteins at the first setting will result in a pretty stiff ride. I had the Bilsteins for 3.5 years on the stock setting with a Zone 2" level kit and the truck rode ok, but was a little harsh on bumps and dips. The coilovers made a huge difference in ride quality.
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