Just took a 19 AT4 for a test ride , few questions ...

[lt1z]

With 20” wheels are Ridge Grapplers mine feels good at speed. Better then my 14 did with 20” summer radials...

[voltedge]

I bought an AT4 with the 20s and then changed those to an OE  22" with a Nitto Ridge Grappler. The ride did get a tad firmer due to the LT tires, but it feels more planted and stable. As far as the shocks, I had a 14' Silverado Z71 that had Ranchos and a 17' 2500 Silverado z71 for the farm with Ranchos as well. Both of those trucks were actually awful to ride in and felt as rough as a 3500 dually unloaded IMO.  I drove  a friend's 2500 identical to mine that had Bilstein on it and it rode exceptionally well for an HD truck. That all said, I sold my farm and no longer figured that I needed a truck for daily commutes and work and I really didn't need the extra tow capacity, so we traded both for a 17' Denali 1500 which has the magnetic ride shocks. I can tell you that other than the Ram air suspension trucks, I have never driven another truck that rode as well as this one does. We ended up making it our "family car" since it is so nice and rides and drives so smooth. Fast forward two and a half years later and I was tired of driving a small sedan even though I was averaging 31mpg. I don't care who says otherwise, but you just can't make a unibody front wheel drive Mcpherson strut based car ride as well with minimal road noise like a body on frame truck or suv. We just took a weekend getaway around 300 miles and I actually think that the new AT4 with the Ranchos it has may ride a tad nicer than my Denali. It's not as plush obviously, but it doesn't wallow around and it has minimal body lean in turns. I also feel like it soaks up hard bumps a little nicer than the 17' Denali. Just my observations......

Edited May 30, 2019 by voltedge

[DrunkViking]

Thank you for all the replies and I have another question . Would swapping the Duratracs for possibly a set of Ridge Grapplers in a 285/70/18 fit and also improve the ride ? 

[voltedge]

We put the Ridge Grapplers on the AT4 and the fact that they're an LT tire, they actually stiffen the ride up a bit. I noticed a definite harshness that the factory tires didn't have, but as a trade off, they seem to have less sidewall flex and the truck handles better in turns.

[2021 at4]

I have a 2021 gmc at4 6.2 20 inch all terrain tires not off road tire just swapped out rear rancho shocks for bilsteins 5100 it was the 2 nd best thing the first was a pulsar lt to delete dfm and start stop crap it rides awesome but i dont off road in a 60k truck