Full Size Jeep Network

anyone running coil overs?
this winter I am hopefully doing d60 steer axles front and rear, 4 wheel steer. soa with sliders front and rear instead of shackles, under frame mounted.

I guess my question is I plan on running axle tech 4000 axles once I finish college, I have a buddy selling them for $3000 for 2 steering axles. and I want to run 44+ in tires, I plan on making it fly that's why the d60's will not last. but I want a decent ride. I have been looking at the KING 2.5 coilover shocks but im not sure how to determine what size springs to run.. any info on spring rate etc. I have read the coilover bible on Pirate but it confuses me.

I'm equally confused with regards to coilover spring rates.

To my knowledge nobody on this site is running coils except for Austin4x4 and his is not for 'wheeling.

I'm running a J10 truggy on tons and 42's, but still on leaves (keep breaking leaves, which is one of the reasons I need coils).

Hoping someone can provide some good info!

Thats what i figured, i guess i may have to go on pirate and ask, i just dont care for it, too many jerks on that site.

There is a post here with coilovers on a J-Truck: http://fsjnetwork.com/forum/viewtopic.p ... ver#p67902

Coil over spring rates are measured the same way standard coils are. The differences is you typically use two rates. One that is softer, and one that is stiffer. The soft one absorbs smaller bumps in the road/trail, and the stiffer one is for when you hit things harder.

BigJ200 (in linked post above) is running 250/350, and he seems to like them.

Wonderful! I forgot about his build!!

One thing to note, the major shock companies will help with figuring out what is going to work for your set up. If you are close to a dealer, they will also help tune the pressures. A "good" off road shop will not only install, but help with the fine tuning. The shop I worked in, we would get people the shocks to self-install and come back to adjust the Nitrogen.

Im not sure if there are any off road shops around me, ill have to check

I'm more of "go-fast" when it comes to coilover tuning. But it works well for crawling, too. I like preload, so I go real light springs. Keep your coils close in weight. The main spring is your 'step up' coil. Run a main spring that is two inches longer than your travel. This stops it from catching the shock edge.

Ignore the preload numbers if you're just a crawler. You'll end up with heavier springs.

You'll need to weight your sprung weight.


Here's from my notes:
Initial spring rate=(Main spring rate * Tender spring rate)/(Main spring rate +Tender spring rate)
Shaft showing= Shock Travel – ((Corner weight/Initial spring rate)-Pre-load distance)
Est spring rate needed: corner weight/(inches shaft showing+preload)


On my TJ I'm on 150/250 front

Reading this all the way through should help. http://www.pirate4x4.com/forum/general- ... hread.html

If possible, weigh your rig -- each corner or at least front and back. My front coilover setup is working fine with 250/350, but I will probably change it out to 400/350. The 250 seems just a bit soft for my tall rig.

BigJ200 wrote:If possible, weigh your rig -- each corner or at least front and back. My front coilover setup is working fine with 250/350, but I will probably change it out to 400/350. The 250 seems just a bit soft for my tall rig.

Where did you place your tender coil stops?

I'm not running tender coils.

No, not a third coil, your secondary coil.

Right now I have it set where I am riding almost entirely on the bottom 350# coil. The 250's are too soft and cause just a little bit too much excitement. Once I swap out the the 250 for a 400, I will have 350/400. That should be perfect.

If you aren't lifted as high as mine, 250/350 could be just right.

Wow, thag surprises me. you running sway bars?

It isn't that far off. I'm just a perfectionist, so I will fine tune it. It doesn't sway. So no need for a sway bar. It is steady and drives straight. It surprises me how smooth it is with 41" tires. At some point, I may put on the 37" I have, which will make it even better.

Coils with no sway bar with that much lift? Be careful with those emergency maneuvers.


Sent from my iPhone 6 using Tapatalk

It maneuvers really well. No tipping or squirrely behavior at all. I really thought I would need a sway bar. But with leaf springs in back it rocks.