4120-04, 8009-1204

Synergy D30 / D44 Heavy Duty Front Ball Joint Sets

SKU: SYN-D3044BJ
Part #: SYN-D3044BJ
Weight: 4 lbs
  • MSRP: $125.00
Purchase through our Dealer Network.
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Our Synergy D30 / D44 Heavy Duty Front Ball Joint Sets replaces your Jeep's factory ball joints with heavy duty ball joints. After over 5 years of development and over 500,000 test miles of research and development and serious abuse, these ball joints are the highest quality ball joints on the market. Our fully greaseable metal on metal design improves durability and performance. The extra large ball joint bearing surface eliminates the inner nylon liner, creating a longer lasting, more reliable joint. If you have a lifted jeep, then you need heavy duty ball joints to put up to the abuse of bigger tires and offroad riding.

Fitment:

Part #Fitment
4120-041990-1992 Jeep Comanche MJ
1990-2001 Jeep Cherokee XJ
1987-2006 Jeep Wrangler YJ / TJ / LJ
1993-1998 Jeep Grand Cherokee ZJ
41201990-1992 Jeep Comanche MJ
1990-2001 Jeep Cherokee XJ
1987-2006 Jeep Wrangler YJ / TJ / LJ
1993-1998 Jeep Grand Cherokee ZJ
8009-12041999-2004 Jeep Grand Cherokee ZJ
2007-2018 Jeep Wrangler JK / JKU
8009-121999-2004 Jeep Grand Cherokee ZJ
2007-2018 Jeep Wrangler JK / JKU
8012-601999-2004 Jeep Grand Cherokee ZJ
2007-2018 Jeep Wrangler JK / JKU
8012-60041999-2004 Jeep Grand Cherokee ZJ
2007-2018 Jeep Wrangler JK / JKU
4140-601990-1992 Jeep Comanche MJ
1990-2001 Jeep Cherokee XJ
1990-2006 Jeep Wrangler YJ / TJ / LJ
1993-1998 Jeep Grand Cherokee ZJ
4140-60041990-1992 Jeep Comanche MJ
1990-2001 Jeep Cherokee XJ
1990-2006 Jeep Wrangler YJ / TJ / LJ
1993-1998 Jeep Grand Cherokee ZJ

Benefits:

  • Compatible with all aftermarket axle shafts (including RCV's) with no modifications needed
  • Without the inner nylon liner, the ball joint bearing is significantly larger than stock leading to a longer lasting joint
  • Maximum strength and reliability due to the heavy duty steel design on all hard components
  • Heavy duty dust boots are made out of industrial grade, wear and tear resistant black nitro-butyl rubber (NBR) to prevent premature rips or tears
  • Available in both knurled and non-knurled options
  • Fully greaseable, metal on metal design provides smooth operation and 

Features:

  • Sintered graphite & oil impregnated bronze ball joint bearing race for a strong, smooth, bearing surface
  • 1045 high carbon alloy steel ball joint housing
  • Ball joint stud is induction heat treated 4140 chromoly steel for maximum strength and reliability
  • Industrial grade, wear and tear resistant black nitro-butyl rubber (NBR) dust boots

Includes:

4120-0441208009-12048009-128012-608012-60044140-604140-6004
(1) Knurled Upper Ball Joint

(1) Knurled Lower Ball Joint
(2) Knurled Upper Ball Joints

(2) Knurled Lower Ball Joints
(1) Knurled Upper Ball Joint

(1) Knurled Lower Ball Joint
(2) Knurled Upper Ball Joints

(2) KNurled Lower Ball Joints
(2) Non-knurled Upper Ball Joints

(2) Non-knurled Lower Ball Joints
(1) Non-knurled Upper Ball Joint

(1) Non-knurled Lower Ball Joint
(2) Non-knurled Upper Ball Joints

(2) Non-knurled Lower Ball Joints
(1) Non-knurled Upper Ball Joint

(1) Non-knurled Lower Ball Joint


Notes:

  • Synergy High Performance Grease recommended
  • Metal on metal ball joints require a small break-in period of typically 100-500 miles to fully "seat" the bearing surfaces. During this time the steering may feel "sticky" or slow to "return to center". Once broken in, the steering will be smooth and tight
  • Knurled ball joints are required when replacing ball joints that have enlarged ball joint bores; It is up to the installer to verify proper fitment
  • View our 12 Month Unlimited-Warranty 
Prop. 65 Warning for California ResidentsMore information: www.p65warnings.ca.gov
    • SKU
      8009-1204
    • Weight
      2.74 lbs
  • Manufacturer
    Synergy Manufacturing
  • Part #
    8009-1204 (1) Upper / (1) Lower, 8009-12 (2) Upper / (2) Lower, 4120-04 (1) Upper / (1) Lower, 4120 (2) Upper / (2) Lower, 8012-60 (2) Upper / (2) Lower, 8012-6004 (1) Upper / (1) Lower, 4140-60 (2) Upper / (2) Lower, 4140-6004 (1) Upper / (1) Lower
  • Synergy High Performance Grease
    No, Yes [4119]

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