Joe_B

Looking for some opinions from people who have run these coils

Current Setup: JKU, 35s, trimmed fenders, 2.5” teraflex coil lift

Future Setup: Planning for 37s, not worried about drivetrain issues or other suspension components, I understand what's involved with running 37s

Should I go with 3” Synergy coils or 3.5” Rock Krawler coils. Seen the RK coils in action and are great but have never seen the Syngery coils.

Thanks!

planman

You don't need either.

With flat flares and the TF front extended bumpstops, you are good for 37s.

With flat flares, if you trim the radius of your rear fender well pinch seam, you are good for 37s with the TF rear extended bumpstops.


Or, you wouldn't need to trim the rear pinch seam as much if you did a 1" body lift.


If you do more than 2.5" suspension lift, you are looking at needing at least:

front adjustable trackbar
different rear trackbar relocation bracket or an adjustable rear trackbar
longer shocks
longer brakelines
longer front swaybar links
front lower adjustable control arms


If you really want to go taller so that you can run longer shocks, the RK progressive springs are pretty cool.

JKred

The synergy springs are progressive as well, front and rear. IIRC they are also one of the longest free length springs available second only to MC's dual rate spring.

planman

The answers that I don't know are the spring rates of the Synergy and RK springs.

You'd want a spring rate that corresponds with the weight of your rig--ie. heavy armor, bumpers, winch, etc. needs stiffer springs.

Joe_B

Thanks for the help. I am thinking Synergy b/c they are some of the longest unloaded coils. I talked to their rep and their spring rate is geared towards a loaded JKU (armor, cage, spare etc.). In the end i can't go wrong with either, I've just been on the fence about which ones i want.

B 1000

So in other words, they are on the stiff side?

planman

They would be if you are light.

pcmasten

Isn't Rock Krawler coming out with a 3 level/rate spring? Anyone know anything about these?

courtsm3

RK is coming out with triple rate coils. 1.5,2.5 and 3.5'.

Smashboogie 4x4

Rock Krawler has the 3.5" Triple Rate coils available right now. The 1.5" and 2.5" will be available nearing December.