I would venture to guess you “might” be able to get a 35 on a stock(ish) offset wheel with 4” of lift (GM 2” lift + 2” rough country level)... if you’re looking to do any sort of offset 33x11.5 or maybe 33x12.5 and up to around -18 offset could work depending on the tire. I’m running 295/55/20 (BFG K02)on a -12 with 4” of lift and I get a hint of rub in reverse on occasion. There are so many variables that it’s hard to say for sure what is going to work. The GMC T1 has a smaller wheel well than its Chevy brother so you can’t stuff as much tire with the same amount of lift.
Interesting. The odd thing is that you don’t see the onslaught of rust on vehicles over here (eastern Washington state) that you see on vehicles coming from the north east.
Yea absolutely they will last longer with any amount of lift the factory UCA is at its limit. I get analysis paralysis anytime I try to pick out a part, think I know exactly the one I want and then end up second guessing myself. I live up north and although they don’t use salt on the roads (yet) the chemical they do use (magnesium chloride) is pretty hard on any raw metal so I don’t think uniball UCA’s are a good option.
I emailed Camburg regarding the longevity of uniballs and the possibility of a ball joint UCA. This was the response I received. “That is something we're looking into right now to offer. We’re designing and developing the ball-joints. It will be months before we have them available though. Uniballs last longer than 10k miles, but do require a little added maintenance of keeping them clean. A ball-joint with a boot and encased in grease holds up to harsher wet environments better than a uniball. Which one to go with depends on where you live, the conditions you're using the truck and how you're using it. They both have pro's and con's to one another”
You should be good to go with a 0 offset wheel. Yea some of the fitments on custom broffsets gallery crack me up “running 22x12 -60mm with a 35x12.50 1 inch leveling kit no rubbing no trimming” lol.
Look at my post on the “factory gm 2” lift installed” thread for a step by step, basically there is a bracket that the mud flap mounts to under the felt wheel liner that can be removed to gain clearance on the backside of the wheel well (side closest to the drivers door) it gains roughly an inch or so of additional clearance. Without it done I could barely turn the wheel, after that I was able to get near full lock. Only having rub in reverse on the front lower valence. You remove the 3 torque screws on the front side of the mudflap, then remove a 10 mm bolt on the back side. The mudflap can then be pulled away from the truck body and pushed towards the engine bay. There will be another torque screw holding the carpet wheel liner to the bracket, remove this and pull the wheel liner up and away as much as you can. This will give you access to the bracket behind it. The bracket has 4 bolts that have 13 or 14 mm heads. Remove those and the bracket comes off. Then put everything back in reverse order. The final step is to drill a small hole on the back side of the carpeted wheel liner near where it attaches to the rear front mudflap and insert and zip tie it into that new hole and an existing hole on the body near it to pull the flap back. Do not drill thru the mudflap, just the carpet. Repeat for the other side. The whole process took me about 30-45 total for both side and I wasnt in a rush lol here is the post. Someone else did the write up I’m not trying to steal it as my own just sharing it as it is very valuable when trying to gain a few inches of clearance. The directions aren’t super clear I’ll admit but peel back your fender liner a bit and you will see exactly what it is referring to.
I saw a bunch of people claiming they weren’t rubbing running some big offsets on just a level on there as well. After seeing first hand on my own truck there is absolutely no way they didn’t trim or do anything to get those to fit unless they somehow drive without ever making a turn...
I have a similar setup to you, 20x9 -12 with 295/55/20. I had done the mudflap mod originally which got rid of a great deal of rub. My setup was a Sierra Sle with factory 2” lift. It rubbed badly before the mud flap mod after that it rubbed mostly in reverse and on the front lower bumper valance. Recently I installed a 2” rough country leveling kit (basically the same setup @lapoolboy is running) it doesn’t rub at all now. Our sierras have smaller wheel wells than silverados so fitment issues are common and frustrating. Your tire is a bit taller than mine (60 vs 55 but with the width difference it should be negligible) fwiw I’m running bfg k02 which are known to run small. Try the mudflap mod first ( I know you said your truck doesn’t have mud flaps but likely it still has the bracket for them behind the wheel liner) after that a small trim on the lower valance should alleviate your issue. If you don’t want to trim you’re going to have to add moar lift. Good luck.
It’s a forum. Not everyone is going to share your rose colored enthusiasm for making the biggest safety feature of night time driving less effective, but to each their own. Good luck on your quest.
I saw those. To be perfectly honest after seeing a cutaway of the design, I’m not convinced there is any real benefit over the Moog problems solvers ball joint but I’m no engineer. The SPC ones look really nice but they don’t have one for our trucks yet. Skip to 17:54 for cut aways of the Moog and icon for your viewing pleasure.
Was just reading up on these. The guys at Filthy Motorsports claim that uniballs need to be replaced every 3-4 oil changes which is way too much maintenance for me. They also say that those billet designs while they look awesome create a much more jarring ride as there is no bushing to smooth things out, the benefit is improved feedback in the steering wheel if you’re getting real sporty. Originally I was planning to go big with the Mazzulla ones but now I’m leaning towards the Camburg with Moog problem solvers ball joints... wish Camburg offered the tubular arm with ball joint like they do for Tacoma’s for our trucks...
On another note got the rough country at4 2” leveling kit installed... it looks maybe a little nose high to me but it looks different depending on where it is parked. Tires no longer rub which was my main concern.
Touched a nerve I guess. Was simply trying to illustrate the massive transformation it has been through, but the only comments seem to be on how ugly it was before. I’m well aware lol. Sorry for my curt reply.
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