JEEP Heavy Duty Ball Joint Sets Dana 30/44 Uppers, Lowers TJ/LJ/XJ/YJ/ZJ 1990 - 2018

Replace your Jeep's factory ball joints with Synergy MFG's NEW Dana 30/44 Heavy Duty Ball Joint Set. These ball joints employ a metal on metal design to improve durability and performance. A must for vehicles with lifts and larger tires. Get rid of that steering wander and play caused by loose or worn out ball joints.

Synergy MFG's New And Improved ball joints are the result of actions that have been taken to address reports of premature wear on the previous iteration Product changes and manufacturing changes have both been made to guarantee you are getting the highest quality ball joints on the market.

Technical Features:

New and Improved Ball Joints - Part #'s 8009-1204 and 4120-04
Compatible with all aftermarket axle shafts (including RCV) with no modifications needed
Fully Greasable metal on metal design for prolonged life
Ball Joint bearing surface area is considerably larger than stock due to elimination of the inner nylon liner for a longer lasting joint
Ball joint housing is manufactured from sintered graphite, bronze, and 1045 steel for a strong, smooth, bearing surface
Ball joint stud is manufactured from induction heat treated 4140 steel for maximum strength and smooth operation
Ball joint dust boot is made from wear/tear resistant black nitro-butile rubber (NBR)
12 Month Unlimited-Warranty (see warranty information)
Synergy High Performance Grease (4119) recommended

Notes:

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 required when replacing knurled ball joints that have enlarged the axle end forging bores
Non-Knurled ball joints recommended for replacing non-knurled ball joints
Due to these ball joints being tight tolerance, metal on metal ball joints, proper fitment is critical. Using the wrong style of ball joints can cause significant steering issues. We always recommend installing non-knurled ball joints until non-knurled ball joints are no longer a press fit into the axle end forging bores. If your axle end forging bores have been enlarged to the point that non-knurled ball joints are no longer a press fit, knurled ball joints are required.
Use of the improper ball joint style for the axle housing voids our warranty. It is up to the installer to verify the proper ball joint style is being used.
8009-1201 ball joints have been superseded by 8009-1204.
4120-01 ball joints have been superseded by 4120-04.

*If you have older Synergy MFG 8009-1201 or 4120-01 ball joints that did not live up to your expectations, Synergy MFG has extended the warranty period for ball joints manufactured in 2016 and 2017 that experienced premature wear. Contact support@synergymfg.com for more info.

Part #	Year	Make	Model	Knurled	Ball Joint Set
4120-04	1990-1992	Jeep	Comanche	Yes	(1) Upper / (1) Lower
4120	1990-1992	Jeep	Comanche	Yes	(2) Upper / (2) Lower
4120-04	1990-2001	Jeep	Cherokee	Yes	(1) Upper / (1) Lower
4120	1990-2001	Jeep	Cherokee	Yes	(2) Upper / (2) Lower
4120-04	1990-2006	Jeep	Wrangler	Yes	(1) Upper / (1) Lower
4120	1990-2006	Jeep	Wrangler	Yes	(2) Upper / (2) Lower
4120-04	1993-1998	Jeep	Grand Cherokee	Yes	(1) Upper / (1) Lower
4120	1993-1998	Jeep	Grand Cherokee	Yes	(2) Upper / (2) Lower
8009-1204	1999-2004	Jeep	Grand Cherokee	Yes	(1) Upper / (1) Lower
8009-12	1999-2004	Jeep	Grand Cherokee	Yes	(2) Upper / (2) Lower
8009-12	2007-2018	Jeep	JK Wrangler	Yes	(2) Upper / (2) Lower
8009-1204	2007-2018	Jeep	JK Wrangler	Yes	(1) Upper / (1) Lower
8012-60	1999-2004	Jeep	Grand Cherokee	No	(2) Upper / (2) Lower
8012-6004	1999-2004	Jeep	Grand Cherokee	No	(1) Upper / (1) Lower
8012-60	2007-2018	Jeep	JK Wrangler	No	(2) Upper / (2) Lower
8012-6004	2007-2018	Jeep	JK Wrangler	No	(1) Upper / (1) Lower
4140-60	1990-1992	Jeep	Comanche	No	(2) Upper / (2) Lower
4140-6004	1990-1992	Jeep	Comanche	No	(1) Upper / (1) Lower
4140-60	1990-2001	Jeep	Cherokee	No	(2) Upper / (2) Lower
4140-6004	1990-2001	Jeep	Cherokee	No	(1) Upper / (1) Lower
4140-60	1990-2006	Jeep	Wrangler	No	(2) Upper / (2) Lower
4140-6004	1990-2006	Jeep	Wrangler	No	(1) Upper / (1) Lower
4140-60	1993-1998	Jeep	Grand Cherokee	No	(2) Upper / (2) Lower
4140-6004	1993-1998	Jeep	Grand Cherokee	No	(1) Upper / (1) Lower

(Lower Ball Joint Cutaway Sample)

(Upper Ball Joint Cutaway Sample)

Synergy HD Ball Joints (above) vs. Mopar Factory Ball Joints (below)
Synergy HD Ball Joints feature a fully greasable sintered metal on bushing design that has high wear resistance. Outperforms the Mopar factory plastic bushing.

Jeep Performance

+Vendors

EVO MFG - JEEP 2.5" Jeep Wrangler JL Boost Stage 1

Synergy - JEEP Heavy Duty Ball Joint Sets Dana 30/44 Uppers, Lowers TJ/LJ/XJ/YJ/ZJ 1990 - 2018

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