BBSierra84

Hey Guys, I posted here almost 4 years ago after putting a 2.25" leveling block on my 14 sierra all terrain, wanted to give an update. I put the ProComp 2.25" block up front (nothing else) at roughly 25k miles, and at about 55k miles my upper ball joints were shot. Not sure exactly why, but would have to assume its from the additional length the spacer added to the shocks, putting the upper control arm out of its operating range. So I got new upper control arms (not sure what part number shop just got me new ones) that are suppose to accommodate a 2-4" lift. Since then, no issues. At 64k my tie-rods were shot as well, had to replace those. While the truck was in the shop, I had them replace the dog shit stock rancho shocks and remove the 2.25" spacer and just use Bilstein 5100, raised about 1.75". The front dropped about 0.5" inch as expected since the bilsteins at one setting below highest are shorter than the ranchos plus spacer. The truck has a slight rake now. Before with the 2.25" spacer, it was dead level. I a running 275/60/20 KO2s, they cleared no problem with the 2.25". Even now with the bilsteins, no issues with rubbing at all. Will for sure go wider tires next, maybe slightly taller too. ( i plan on going 17s with 0 offset). The ride is MUCH better than those ranchos, especially after 64k miles. The ride is still firm but the rebound and compliance of the truck now is so much better. Only had the bilsteins 5100 (front and rear) on for a week now, but the ride difference was immediately apparent. Its most noticeable when you push the suspension a bit. Riding down the hwy on a smooth road isn't that different, but when you hit a bump/break in the road/dip, is when you really notice it. The initial impact is still hard, but with the ranchos the truck would literally bounce off the ground, with these bilsteins it comes right back to where it should be. Should have done this right when i bought the truck.

Just a quick update here....... I removed that worthless front air dam...... It looks 100x better in my opinion. I have seen virtually zero MPG loss (maybe 0.5mpg, but that can very easily be driving style/conditions). The front air dam is for sure staying off. ALSO - Interesting note, I went back to the shop that did my installation of the Pro Comp leveling kit, as I heard a few squeaks here and there. They said everything was fine (shocker) and they didn't notice anything. BUT, they did re-tighten everything. The truck ride is MUCH better now, basically back to stock - I initially said the truck rode firmer after the level, which is did, but now it seems like it is back to original. There was definitely a difference before and after they re-tightened the suspension components after about 1000 miles on the new kit. I would recommend this to everyone. Pics below without the front air dam. Also a little fun in the snow, tires are awesome.

Stock 2014 GMC Sierra All Terrain rims, 20".

Hello All, First off, I want to say thank you to everyone on this forum, for all your research, information and pictures. It made my effort on the modification on my truck much easier. I have taken many pictures and tried to get as much details about before/after in ride height and fuel mileage for everyone. I hope this helps everyone who is looking at doing the same. My truck had an almost 4” rake before the level, which drove me nuts and the low ground clearance in front, were the main reasons I added the level and larger tires. Absolutely love the way the truck came out, would do it again in a heartbeat. 2014 GMC Sierra Crew Cab SLT All Terrain 5.3L Short Bed Level Kit - Pro Comp 2.25” level Tires - 275/60/20 BFG A/T KO2s RIDE HEIGHT Before (measured from the ground through the center of the tire to the wheel well): Front - 36” Rear - 39 ¾” After (same measurement technique): Front - 38 ¾” Rear - 39 ¾” Pro Comp 2.25” Level Front end only (nothing done to the rear). I went with this kit instead of the RC 2.5” because it seems to be of a slightly higher quality material and I didn’t know if that additional .25” would make it look too tall with 275/60s. I measured multiple times before to ensure accuracy, as well as multiple times after. Yes, I thought was a little odd that the rear didn’t come up since the new tires were just over a full inch taller, but seems this isn’t the only case. Front came up exactly 2.25” + 0.5”. I adjusted the headlights slightly after because they ran a little high, easy adjustment. RIDE QUALITY Before the level kit and tires, this truck rides great, especially for this large of a truck. It was incredible quiet and surprisingly soft. After the level kit and tires, there is a very noticeable stiffness in the front end now. By no means is it too stiff, but coming from how soft the stock truck is, its a much firmer ride. (I have gotten use to it since the initial drive from the shop). I am sure this is a combo of the level kit and tires. Being a firmer ride, I would argue that the truck actually handles turns better now with the firmer setup. Sound - The level kit I wouldn’t imagine would have any difference in road noise, maybe wind noise as it sits higher, but with the new KO2s, you can hear a little bit of a buzz on the highway over stock (stock tires are incredibly quiet). Most people would not even notice, especially if the music is on. Acceleration - These new tires (BFG A/T KO2s 275/60/20) are much heavier than the stock Goodyear Wrangler SR-A (275/55/20), and you notice it immediately. Again, nothing you won’t get use to with time, but right after they were put on, accelerating off the line it is noticeable that these tires are in the range of +16lbs per tire. This plays into MPG below. MPG Before I was in the range of 17 CIty and 22 Hwy. After the level and tires, I am in the 15 City and 21 Hwy. When I am going just around town in traffic, it can easily be in the 14 mpg range. On the highway, I haven’t noticed that big of a difference each drive is a little different and it’s in the 0-2mpg range. (Don’t have many really flat hwys where I am) TIRES Had the stock Goodyear Wrangler SR-A (275/55/20) previously and they are great highway tire, but terrible off road and in bad weather. I wanted to go with a good all terrain tire that I can take off road, use in the snow and still be on an everyday truck. I was originally going to go with the 275/65/20 KO2s but were out of stock and it would take 3 months to arrive, and I was getting a super deal, so I went with what they had in stock, 275/60/20. The shop I went to said there is a small chance the 65s would rub a little with the Pro Comp 2.25” level, so I decided to play it safe, and cheaper with the 60s. (Plus the 65s would be even heavier and higher load rating) They fit VERY easily, not even close to rubbing anywhere. I will probably go with the 65 series when these wear out for a little extra height and the look. So far I have had them on city, hwy, snow and light off road, and they have been great.