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4in Jeep X-series Suspension Lift Kit

Jeep Suspension Lift Kit [639P]
Jeep Suspension Lift Kit [639P] Installed
Jeep Suspension Lift Kit [639P] Installed
Jeep Suspension Lift Kit [639P] Installed
X-Flex Control Arm Joint
In stock
SKU: 639P | Brand: Rough Country
Make sure it fits!


  • Download Instructions
  • Install Time: 6-8 hours
    Average estimated install time peformed by a professional shop or mechanic.
  • Tires: 265/75 R16
    Recommended tire size for use with this kit. Please see Instructions for complete notes on this tire size recommendation.
  • Wheel BS: Factory
    Recommended wheel backspacing for use with this kit. Please see Instructions for complete notes on wheel backspacing.
  • Features

  • Easy bolt-on installation
  • Increased ground clearance
  • Levels the front with the rear of the vehicle
  • Lower control arms provide proper offset to allow for wider tires.
  • Control arms include Clevite brand OEM style rubber bushings
  • Kit maintains stock alignment for precise high speed handling and proper caster/pinion alignment.
  • Rear shock relocation keeps shocks clear from the tires.
  • X-Flex control arm features:
    • Clevite brand OEM style rubber bushings.
    • Flex joints are fully rebuildable.
    • Flex joints feature a massive 2.5" diameter body and 1.25" thread.
    • Fully greasable.
    • Adjustable retainer ring.
    • Lower joints pivot up to 35 degrees.
  • Notes

  • Does NOT fit AWD models.
  • Models equipped with a CV style front driveshaft may result in driveshaft vibration. If this occurs, replacing the driveshaft, axle yoke and / or transfer case yoke will need to be performed to rid the vehicle of driveline vibration.
    CV Driveshaft Example
This product features Rough Country's Lifetime Replacement Warranty. All products are warranted to be free from defects in material and craftsmanship for the life of the vehicle if utilized in accordance with the manufacturer's instructions for installation and operation of said products. For complete details and coverage information please click here.
We are proud to offer Same Day Shipping. If you place your order before 4pm (cst) your order will be shipped that day. Parts ordered must be in stock for the order to ship. Approximately 97% of all orders placed leave our warehouses within 24 to 48 hours(not including weekends & holidays). For complete details please click here.


  • Front
  • Lifted coil springs
  • Adjustable lower control arms
  • Sway-bar quick disconnects
  • Adjustable track bar
  • Bumpstop extensions
  • Transmission crossmember spacers
  • Hardware
  • Rear
  • Lifted coil springs
  • Upper control arm bracket
  • Sway-bar brackets
  • Bumpstop extensions
  • Shock relocation kit
  • Hardware
  • Shocks
  • (4) Performance 2.2 Series

Fitment Table

Years Drive Make Model
1999-20044WDJeepWJ Grand Cherokee
Always check the product's overview, for more important fitment information


  1. Great kit! - Posted by: Jeff (8/31/15)

    I bought this kit back in 2012. It was easy to install, had it up and running in about 8 hours. Things I learned that I would like to pass on to anyone wanting to do this. 1, like it says in the note, you will need a new front drive shaft. 2, check all of your tierod ends, ball joints, and control arm bushings. I had horrible death wobble, at no fault of the kit, it was my tires and tierods. 3, Take it to a shop that deals with lifted vehicles for an alignment. Do all that, and you'll be more than happy and way less frustrated. I wheel with my friends who drive wranglers lifted with 35's, I have no problems. So, there you go.

  2. awesome product - Posted by: samk (8/17/15)

    Awesome lift, very happy, I was told by several shops since I have the 99 jeep grand Cherokee it wouldn't be possible to lift it because the "death wobble" I was told about this lift and was finally able to lift my trucks without any problems , very affordable price aswell

  3. great product - Posted by: kevin (6/27/14)

    great product, smooth ride, great price. i had the 2" lift and it was good, but i'm really happy i went to the 4" lift. performs awesome.

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