Fits the following applications:

'87-'06 Jeep Wrangler LJ/TJ/YJ
'93-'98 Jeep Grand Cherokee ZJ
'90-'01 Jeep Cherokee XJ

Part #: 4140-6004

Synergy Manufacturing Jeep Wrangler TJ/LJ/YJ, Jeep Cherokee XJ and Grand Cherokee ZJ D30/D44 Heavy Duty Non-Knurled Front Ball Joint Set

Description:
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  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
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.