Scroll to top

2018 Jeep Wrangler JL with JSPEC™ J-Rated 3.5" Lift System

JKS New Product Announcement: Jspec 3.5" J-Rated Suspension Systems Now Available for 2018 Jeep Wrangler JL

Coldwater, MI — Building on the widely popular Jspec 2.5" J-Rated suspension systems released earlier this year for the Wrangler Unlimited JL models, JKS Manufacturing is excited to announce the addition of 3.5" J-Rated Systems offering similar performance benefits with the addition of more lift for increased tire clearance and suspension travel. Engineered to maintain on-road comfort and handling while improving offroad capability, these new 3.5" J-Rated Systems build on JKS's legacy of innovative solutions building a true dual purpose platform ready for your next adventure.

At the heart of any true Jeep suspension system are properly designed coil springs. By developing specially tuned sets of dual rate coils springs, JSPEC™ coils provide the best performance in any driving situation. Whether loaded down with gear for a weeklong expedition, running light for some rock-crawling fun or loaded with a few friends for a trip to the beach, JSPEC™ coils will provide the ride you want and the performance you need. Anticipating the desires of many in the JL community JKS has developed two versions of their dual rate coil spring, the first being the standard dual rate springs offering smooth, predictable performance as well as new heavy duty (HD) dual rate coil springs specially designed for JLs outfitted with winch bumpers, racks and loaded down with other gear. The HD springs net roughly 1/2” more lift than the standard springs and are designed for extra load capacity. Pairing to these coil springs you’ll have the option of Jspec gas charged twin tube shocks or FOX 2.0 adventure series monotube shocks, both designed to improved capability when you hit the trail. Initial launch of kits will be with Jspec shocks with the FOX 2.0 adventure series and additional FOX options to follow soon after. Next up on the parts list is the JKS adjustable track bar. Known for its strength and superior design, this track bar is built from 1.5” OD heavy wall DOM tubing.  The bar is formed for maximum clearance to the front axle and uses a threaded end with jam nut and durometer specific bushings at both ends to properly position the front axle while isolating NVHs. Also positioning the front axle is a set of lower control arm cam locks to correct caster for improved driveability.

When its time to hit the trail a supplied sway bar quicker disconnects can be easily removed by pulling the clips and swinging the links up out of the way for increased articulation. These sway bar disconnecting links maintain quiet on-road comfort and quiet operation using an adjustable design with spherical poly-flex ball bushings capable of high-misalignment. New for the JL quicker disconnects is a frame mounted retention bracket to secure your sway bar up out of the way when you’re on the trail. Along with sway bar disconnects to increase articulation a pair of billet aluminum bump stop extensions are also included to control suspension up travel.

In the rear these 3.5" J-Rated Systems utilize a pair of standard or HD coil spring along with extended length rear sway bar links to correct sway bar operating angle. The rear axle is repositioned using a heavy duty rear track bar bracket designed to key off the factory bracket for more strength while centering the rear axle under your JL. Additionally rear bump stop extensions are supplied as well as a matching set of Jspec gas shocks of FOX 2.0 adventure series shocks to round out this package. Improve not only your new Wrangler JL’s appearance, but its offroad capability and on-road comfort with this new 3.5” J-Rated Jspec System from JKS Mfg.

Media Gallery


View 3.5" J-Rated System Online

View Install Instructions

New Product:

3.5" J-Rated Suspension Systems for Jeep JL

Kit ID Number(s):

119K (JL 4Dr - standard springs)

120K (JL 4Dr - HD springs)


$1133.20 (w/ Jspec gas shocks)

$1345.00 (w/ FOX 2.0 adventure series shocks) *coming soon*


2018 Jeep Wrangler Unlimited JL (Sport, Sport S, Sahara)

2018 Jeep Wrangler Unlimited JL (Rubicon)

2.5" J-Rated Kit Features:

  • Front/Rear dual rate coils springs (standard or HD)
  • Front/Rear Spec gas shocks or FOX 2.0 Adventure shocks
  • JKS Mfg front adjustable track bar
  • JKS Mfg front sway bar quicker disconnects w/ retention brackets
  • Front caster cam locks
  • Front/Rear bump stop extensions
  • Rear extended sway bar links
  • Rear track bar bracket

Kit Notes:

  • Stock wheels cannot be reinstalled w/o installing wheel spacers (clearance issue to rear sway bar links)
  • Non-Rubicon models come from factory with lower ride height, will net slightly over 4" of lift

Available Accessories:

  • #1621 - Front J-Link Lower Control Arms (pr)
  • #1671 - Rear J-Link Lower Control Arms (pr)
  • #3571-JL - J-Cal/Flashcal Programmer

Recommended Tire/Wheel Specs:

Rubicon: 37x13.50 Tires on 17x9/18x9/20x9 Wheels (4.5" BS)

Non-Rubicon: 35x12.50 Tires on 17x9/18x9/20x9 Wheels (4.5" BS) 

© JKS Manufacturing

About JKS: Since 1989, JKS Manufacturing has developed some of the most widely used and respected products for Jeep vehicles in the off-road industry. From the original Quick Disconnect™ brand of quick-release swaybar disconnect systems, to the innovative ACOS Pro™ variable height coil spring spacer with integrated bump shock, JKS® only manufactures products that provide unquestionable benefits to vehicle performance. It's no coincidence that those who know Jeep performance best choose JKS products for their own vehicles.

JKS Manufacturing, 491 W. Garfield Ave. Coldwater, MI 49036

(517) 278-1226 | |


Factory Protection Plus Badge

The Ultimate Lifted Suspension Protection Coverage and it’s FREE!

Limited Lifetime Warranty
Factory Protection Plus
  • 5 Year, 100,000-mile PLUS Protection
  • Free, no cost protection for JKS customers
  • Could save thousands on possible repairs
  • Easy online application process
  • Available for most late model vehicles
Drivtrain 5year 60K Mile Protection Drivetrain Warranty

A 5 year - 100,000-mile plus drivetrain warranty is available for Jspec equipped vehicles as a Supplemental Drivetrain Limited Warranty to match your new vehicle express drivetrain limited warranty Jeep. The protection applies to any Jspec eligible suspension systems purchased on or after November 1st, 2013.

Drivtrain 5year 60K Mile Protection
What is FMVS No. 126?

When you see the FMVSS Compliant Symbol you will know with confidence this application has been tested and successfully passed the Federal Motor Vehicle Safety Standard No. 126 compliance test. This highly specialized test was performed to prove the installation of the particular Jspec suspension system, with specified wheel and tire package will not compromise the performance and effectiveness of the vehicle’s Electronic Stability Control (ESC) system keeping you safer on the road.


Notice Something New?
See what's new at!

Shop On Your Phone or Tablet

All new website for fast and easy shopping on any device.

Improved Shopping Experience

Find everything Jeep Suspesion at your fingertips!

Follow JKS on Social Media


Get Deals Directly
Be the first to know of deals at JKS

NEW - Email Sign Up

Sign In or Create an Account