Jump to content

Best leveling coilovers/UCA with stock rims

TEXAG14Denali
 Share

Recommended Posts

SierraZ714x4 Enthusiast

SierraZ714x4

Posted
Posted

I'm running the fox 2.5's with cognito UCA on stock 20's now with 275/65/20's and it looks awesome. Definitely recommend the 65's over the 60's hands down.

  • Like 1
  • Replies 72
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

SierraZ714x4
SierraZ714x4

I'm running the fox 2.5's with cognito UCA on stock 20's now with 275/65/20's and it looks awesome. Definitely recommend the 65's over the 60's hands down.

corncob
corncob

There's some confusion that arises every time this issue of cutting the bump stops comes up.   What the Cognito and maybe other UCA instructions say is to cut the service perch from underneath where

Posted Images

TEXAG14Denali Enthusiast

TEXAG14Denali

Posted
  • Author
Posted

Good to know. Can you send pictures of your truck? Do you know if they cut the extension stops on your frame or if that doesn't apply when getting new UCA?

 

 

Thanks

Also are you running your shocks at 3"?

SierraZ714x4 Enthusiast

SierraZ714x4

Posted
Posted

Yes, I've been meaning to post some i just haven't gotten around to getting some good ones.

 

No, we did not cut the bump stops but i haven't really gotten it off road yet so i may cut them when hunting season comes around and i really get to try these things out.

TEXAG14Denali Enthusiast

TEXAG14Denali

Posted
  • Author
Posted

I would love to see some pictures. Don't have to be good ones just want to see how the truck sits and the tires. Would you recommend cutting the bump stops out while I have them installed? Any negative effects of this?

 

Thanks for the help

Sierra706 Senior Enthusiast

Sierra706

Posted
Posted

I would love to see some pictures. Don't have to be good ones just want to see how the truck sits and the tires. Would you recommend cutting the bump stops out while I have them installed? Any negative effects of this?

 

Thanks for the help

Pros are increased wheel travel and a more comfortable ride over rough terrain.

 

Cons are overtraveling at full droop which can damage coilovers and shocks which aren't designed to suffer that abuse regularly, and potentially popping a cv joint.

 

 

Sent from my iPhone using Tapatalk

corncob Enthusiast

corncob

Posted
Posted (edited)

There's some confusion that arises every time this issue of cutting the bump stops comes up.

 

What the Cognito and maybe other UCA instructions say is to cut the service perch from underneath where the UCA attaches to the frame. This is not a bump stop. If you don't cut it out and put in coilovers with a bit longer travel than stock, it is my understanding that your UCA will contact that during travel instead of your coilovers being your limiting factor.

 

It's the piece shown here underneath the left branch and bolt of the UCA.

c9ba4e4fbc0d6caa2e30a1942613e3a1.jpg

 

This is after the stock UCA is removed.

7b2a51a6cc88b7971e1a380788bc1182.jpg

 

And here is the cut job in progress. I cut it out with a reciprocating saw, then smoothed off the edges with a grinder.

9a9b87d1e8361079e289e9189e8ad164.jpg

 

 

Sent from my iPhone using Tapatalk

Edited by corncob
  • Like 1
TEXAG14Denali Enthusiast

TEXAG14Denali

Posted
  • Author
Posted

Great information Corncob. Thanks for the pictures. I am thinking I will probably lean towards cutting it. How hard do you have to be on them for something to go wrong if they are cut?

 

Thanks for all the help guys!

ChevyRoofer Senior Enthusiast

ChevyRoofer

Posted
Posted (edited)

Great information Corncob. Thanks for the pictures. I am thinking I will probably lean towards cutting it. How hard do you have to be on them for something to go wrong if they are cut?

 

Thanks for all the help guys!

 

This guy has been the only one who actually has done it I believe on the forums. But honestly his truck looked like it was only driven in extreme off-roading conditions.

 

http://www.gm-trucks.com/forums/topic/188300-psa-cognito-ucas-fox-20-coilovers-over-travel/

 

If you're just going to be driving the backwoods to a hunting lease or something, you'll definitely be just fine cutting the perch.

Edited by ChevyRoofer
corncob Enthusiast

corncob

Posted
Posted

I went very slowly on this side (you can see I left the tabs on the left and right) because I was worried about cutting into the actual frame bucket. I ground off most of them after that picture.

 

The other side, I put the blade right between those tabs and the frame bucket and cut.

 

If you are concerned about cutting too much off, cut a bit, then put the UCA in there and move it down. You won't have anything rubbing on that spot (it bolts in up above) so you really just need to make sure the arm clears when it goes down. If it doesn't clear or is too close for you, cut/grind a little more. I don't think you probably need to cut the whole width of it out to clear.

 

 

Sent from my iPhone using Tapatalk

corncob Enthusiast

corncob

Posted
Posted

 

This guy has been the only one who actually has done it I believe on the forums. But honestly his truck looked like it was only driven in extreme off-roading conditions.

 

http://www.gm-trucks.com/forums/topic/188300-psa-cognito-ucas-fox-20-coilovers-over-travel/

 

If you're just going to be driving the backwoods to a hunting lease or something, you'll definitely be just fine cutting the perch.

That thread is a completely different issue - the UCA contacting the frame tower/bucket/column above the UCA/frame bolt connection on extreme uptravel. It has nothing to do with cutting the service perch.

 

On the issue in that linked thread, it started with a guy using fox 2.0's. spurshot did confirm that his had the same issue (but maybe not as severe) with his Kings. I haven't seen the problem show up at all on mine, even after traveling off-road. If it does, it's a very minor fix of putting some rubber on the frame column/tower, or cutting a very small bit of it away to fix it - because of this and the very limited reports of it, I haven't worried about it at all. And I haven't seen it manifest itself yet, despite a good amount of use.

 

 

Sent from my iPhone using Tapatalk

corncob Enthusiast

corncob

Posted
Posted (edited)

I am currently running Boss Coilovers at 2.5" with stock 20s on 295/55R20s. Didn't change out the UCAs. No rubbing. The ride is absolutely night and day from the factory ride.

 

Boss Coilovers are from Halo Lifts. They have been around for years with products for Ford trucks. They recently brought on their line of GM products. They tested for a year or so on their shop truck. With their ultimate kit they are running 35's on stock 20s. I will provide a link to their website and a link to their ultimate kit. They also have been working Total Chaos UCAs which I will also provide a link too.

 

Boss Coilovers website: http://www.f150lifts.com/HaloLifts_bymfg_15-0-1.html

 

Ultimate Kit direct link: http://www.f150lifts.com/2007-UP-GM-SilveradoSierra-1500-Boss-Ultimate-Kit_p_220.html

 

Total Chaos UCAs link: http://www.f150lifts.com/Total-Chaos-Upper-Control-Arms-for-the-GM-1500-2014-2wd-4wd_p_237.html

 

 

 

I spent a lot of time researching like you I am sure. I saw the above thread and called Alex directly. He explained the entire company background to me and the entire testing process of the Boss Coilovers on their shop truck. I was sold once I spoke with him for nearly an hour. I am glad I made the choice of Boss Coilovers and I don't think you will be disappointed either.

 

 

 

I've been following that thread and just posted asking the rep for some details on fitting the tires. Just saying "it fits 35's" only tells you 25% of what you need to know. It's very misleading, IMO, whether intentional or not. It's as helpful as finding a single YouTube video with a guy running 35's, but no way to tell what tire/offset/trimming he did. And that all matters HUGELY when you're trying to squeeze the biggest tire possible.

 

 

 

 

Sent from my iPhone using Tapatalk

Edited by txab
TXSierra507 Enthusiast

TXSierra507

Posted
Posted

I've been following that thread and just posted asking the rep for some details on fitting the tires. Just saying "it fits 35's" only tells you 25% of what you need to know. It's very misleading, IMO, whether intentional or not. It's as helpful as finding a single YouTube video with a guy running 35's, but no way to tell what tire/offset/trimming he did. And that all matters HUGELY when you're trying to squeeze the biggest tire possible.

 

 

 

 

Sent from my iPhone using Tapatalk

I can't speak for running 35's nor can I speak for Alex at what all they did on the shop truck. I have never meet Alex in person or seen their shop truck. I am however, sure that if you call him up he will go into depth with you in regards to their setup. He is a very knowledgeable guy.

corncob Enthusiast

corncob

Posted
Posted

I'm sure he would. But I'm not interested in just finding out the knowledge. I'm interested in him clarifying their claims so people don't spend money on their system and then buy 35's with the assumption they will fit, and then be disappointed/mad/remorseful/mislead. Which is why I posted that request for info in that thread.

 

I'm not implying he's trying to deceive. I just think clarity benefits everyone involved.

 

 

Sent from my iPhone using Tapatalk

TEXAG14Denali Enthusiast

TEXAG14Denali

Posted
  • Author
Posted

Yes, I've been meaning to post some i just haven't gotten around to getting some good ones.

 

No, we did not cut the bump stops but i haven't really gotten it off road yet so i may cut them when hunting season comes around and i really get to try these things out.

I am hoping to install and get tires next week. Can you text me some pictures of your truck with 275/65/20 please? I will dm you my number

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Coastie05
      Replacing 2.7L on 2021 Silverado with 2023 2.7L

      By Coastie05 · Posted

      I’m definitely interested to hear the end result here. 
    • MASONV88888888
      Another 6.2L engine failure!

      By MASONV88888888 · Posted

      My 2025 Silverado 1500 had to receive a brand-new engine (long block) under warranty last month at only around 16,500 miles. Before the replacement, the truck repeatedly displayed "Engine Oil Level Low" warnings, even though the Oil Life Monitor still showed around 50% remaining after about 6,000 miles since my last oil change. After seeing the warning several times, I checked the dipstick with the engine cold, and the oil level was completely normal. The next day, the message escalated to "Add Engine Oil." At first, I assumed it was just a faulty oil level sensor, so I brought the truck to the dealership. After inspecting the engine, they found internal cylinder wall scoring and ultimately replaced the entire long block under warranty. Before this happened, I was planning to install a 4-inch lift and suspension upgrade on my truck. After needing a new engine at just 16,500 miles, I honestly don't see the point anymore. I also contacted GM to ask whether my vehicle qualified for a buyback, but I was informed that it does not at this time. Anyway, this experience has left me with serious concerns about the long-term reliability of this engine. I sincerely hope NHTSA expands the current investigation or recall to include 2025 model and performs a thorough inspection of affected vehicles. My biggest concern is that these engines may fail shortly after the powertrain warranty expires. If GM truly stands behind this engine, then at the very least, please consider extending the powertrain warranty to 10 years for affected owners. That would go a long way toward restoring customer confidence.
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      Without exception but then I'm the odd duck, right? I know what goes into that test, how it is calculated and thus how to beat it. But EPA values are often not beaten by the general public and the government has in past years adjusted the means and methods to come to those values to more closely approximate "Joe Average".    The only real trick to beating that EPA average is don't drive like "Joe Average".    It's the same method you used to profit from "Economic Migration" and in doing so beat the 'stats'. But you, like me, are not "Joe Average".     The thing you don't seem to grasp is this "Purchasing Power Index" isn't forward looking. It doesn't predict what it going to be but looks backward and states what it was. They are not telling us what the THINK, they are telling us what they MEASURED. Example:    Wife says "I'm going to lose 40 pounds by Christmas". May she does, maybe she doesn't but the doctors office who weighed her when she made that statement and again at Christmas only REPORTS what the RESULT was. You and I can banter about what was possible and what aunt Tilly did till the cows come home but the result is the result. Arguing otherwise is.....irrational. That's all I'm saying. This isn't about:      What you are calling a 'Statistic' is a RESULT not a CALCUATION and as a result the RULE. Like gravity as a rule, it can not be broken. 
    • MASONV88888888
      Rattle in the rear!

      By MASONV88888888 · Posted

      Just wanted to say thank you for posting this. Years later, your thread is still helping Silverado owners.   I bought my 2025 Silverado 1500 in January 2025, and I've had what feels like the exact same rattle since day one. After reading your findings, I believe my truck has the same issue with the cable carrier contacting the rear sliding window. To be honest, I had pretty much given up on pursuing the issue. It wasn't until I recently drove another brand's pickup that I realized just how quiet their cabin was—and how noisy mine has been all along. On my truck, the rattle happens on almost any paved road, gets even worse on rougher pavement, and I can even hear it during braking and acceleration.   I actually referenced your thread when submitting my case to GM, hoping they'll recognize this as a recurring issue instead of treating it as an isolated incident. The reason I reached out to GM first is because my dealership told me they would need to keep the truck for at least two days just to diagnose the problem. I was concerned that even after two days, they still might not be able to identify the source of the rattle before giving the truck back to me. I had also asked a few dealerships about this issue during previous service visits, but none of them seemed to know what was causing it or had a solution. That's why I decided to contact GM directly first, hoping they might already have an official repair procedure or guidance for this issue.   I also hope GM eventually comes up with an official fix for this problem. I have a feeling there are many Silverado owners experiencing the same rattle, but most either choose to live with it or simply don't know what the cause is.   Really appreciate you taking the time to document your diagnosis. Your post is still making a difference years later.
    • Buckwild27
      Gas Prices

      By Buckwild27 · Posted

      I have 2 choices. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...