I have a 2013 2dr jk with fox 2.0 reservoir suspension, rubicon express coils 2.5” when offroading in dunes and starts to lose traction the front diff starts hopping, I eliminated it almost completely with this shocks but I still get some of it, I would like to know if anyone has spring rates of teraflex springs and the other brands, I think that something stiffer would do the trick and eliminate that problem, I run 5psi and have rubicon express arm relocators

 

Before more wise members join in, I will offer my limited perspective... Each year there seems to be more options from many manufacturers regarding spring rates. I am new to the Jeep game, but I now see companies offering variable rate springs, stiffer springs, and plush ride springs. For example, I have Terraflex "traditional" springs, which I would classify as a spring more focused on ride quality than say their Overland Springs, which are stiffer for added load carrying. That is to say, I think you need more specifics than just "Terraflex Springs" as they have multiple options. Then there is the difference between spring manufacturers and personal preference to contend with... That is, what I think is a "good" ride is entirely subjective and may not align to your expectations. To get rid of personal preference considerations you need a common measure like spring rate and level of spring variability. Thus, as folks chime in with their experiences, you might want to see if you can chase down more specifics like spring rate and variability to anchor to your experiences with the springs you have now (e.g., "everyone who says they don't have this problem and like their springs have heavier rated springs than I have").

Regarding your specific challenge, my opinion is shocks likely address the bulk of the issue assuming your axle is not jumping a ridiculous amount. Stiffer springs would likely also help as they would take some of the "load" off of the shocks to contend with, but likely not as much as stiffer shocks. Fox 2.0 shocks are amongst the stiffer shocks available, based on what I have read; so you are likely at the point of diminished return with your shocks (i.e., slightly stiffer shocks will likely not have as big an impact as stiffer springs). I also wonder how much center of gravity affects your issue? I imagine lowering your center of gravity would help too as would stickier/wider tires so as to avoid loosing traction more often in the first place.

To test out some of these concepts a little more, do you note the problem happens under certain conditions more often than other conditions (e.g., going up hill or down hill versus flat land, off camber versus flat ground, etc.)?

 

I don't wheel in the sand as there's nothing really around me, but what you describe seems pretty typical of sand wheeling. I don't think going as stiff as possible is really the right solution given the amount of wheeling you do in the sand relative to all the other driving you do.

 

You don't throw springs at the issue, springs are meant to support the weight of the vehicle and help you achieve lift. Fox 2.0 with reservoirs can be valved to tame your issue, Ask a shock tuner to help you out, people for example like Accutune offroad can do this, https://accutuneoffroad.com/
You may need to have the low speed compression/rebound adjusted on those shocks.

 

A friend has 2.5” procomp springs, same shocks, and he even does not have control arms correction brackets, so the only thing I had left to do has removing the brackets, which may be worse for the problem or changing the springs, that’s why I am asking

 

Are you disconnecting your front sway bar ? what's the pressure on yout tires when doing this sand driving ? and are you getting wheel hop because you're getting stuck or you're just trying to drive fast over sand ?

 

I don’t disconnect front sway bar, y run 4psi and does not happen, unless I am towing and with 7 psi it does it when driving up a steep hill and kind off losing traction and not going too fast, just second gear full throttle and kind of getting stuck but still going forward medium speed