Ball Joint - Lower

This procedure covers the removal and replacement of the lower ball joint on the front suspension of a 2007 Ram 3500 with 5.9L Cummins diesel engine and 4WD.

Warnings

Tools required

Parts

• Lower ball joint (driver or passenger side as needed) × 1 — Moog K3134T or equivalent heavy-duty
• Castle nut for ball joint stud × 1 — Often included with ball joint
• Cotter pin × 1 — Use OEM specification
• Brake cleaner × 1 — Aerosol spray

Preparation

1. Park vehicle on level ground and set parking brake firmly
2. Chock rear wheels securely on both sides
3. Loosen front wheel lug nuts while vehicle is on ground (do not remove)
4. Raise front of vehicle with hydraulic jack at frame lifting point
5. Support vehicle with jack stands positioned under frame rails, ensuring vehicle is stable
6. Remove wheel and tire assembly completely
7. Spray all suspension fasteners with penetrating oil and allow to soak for 15-30 minutes
8. Clean area around lower ball joint and control arm with wire brush and brake cleaner

Procedure

1. 1

   Support the lower control arm
   Position a hydraulic floor jack under the lower control arm as close to the ball joint as possible without interfering with disassembly. Raise jack until it just contacts the control arm with light pressure. This will support the suspension load when the ball joint is separated and prevent sudden dropping of components.
2. 2

   Remove brake caliper and rotor
   Remove the two brake caliper mounting bolts and carefully hang the caliper from the frame using a wire or bungee cord to avoid stress on the brake hose. Do not let caliper hang by the brake line. Remove the brake rotor from the hub by pulling straight off. If rotor is stuck, use penetrating oil and tap with rubber mallet. Remove ABS wheel speed sensor if it interferes with access to ball joint area.
3. 3

   Disconnect the tie rod end
   Remove the cotter pin from the tie rod end castle nut. Loosen but do not fully remove the castle nut. Use a ball joint separator or pickle fork to break the taper between the tie rod stud and steering knuckle. Once separated, remove the castle nut completely and swing the tie rod out of the way. Be careful not to damage the tie rod boot.
4. 4

   Remove the hub and bearing assembly
   Remove the bolts securing the hub bearing assembly to the steering knuckle from the back side. Verify the correct socket size against the service manual for this heavy-duty axle. Pull the hub assembly straight out from the knuckle. If stuck, use a soft mallet to tap evenly around the back of the hub. Set hub assembly aside in a clean area.
5. 5

   Separate upper ball joint from knuckle
   Remove the cotter pin and loosen (but do not remove) the upper ball joint castle nut. Use a ball joint separator to break the taper between the upper ball joint stud and the steering knuckle. Once separated, remove the castle nut. The knuckle should now be free from the upper control arm but still attached to the lower ball joint.
6. 6

   Remove lower ball joint castle nut and separate knuckle
   Remove the cotter pin from the lower ball joint castle nut. Using a breaker bar and appropriate socket, remove the castle nut completely from the lower ball joint stud. Use a brass or rubber mallet to strike the side of the steering knuckle mounting boss to break the taper. If necessary, use a ball joint separator with caution to avoid damaging the knuckle. Once separated, remove the steering knuckle assembly completely and set aside.
7. 7

   Press out the old lower ball joint
   With the steering knuckle removed and on a sturdy workbench, inspect the lower ball joint bore. Clean any rust or debris from around the ball joint. Select the appropriate receiver cup from the ball joint press kit that will fit around the ball joint body. Position the receiver cup on the back side of the knuckle. Select a pressing adapter that contacts only the ball joint housing (not the stud). Assemble the ball joint press with the screw-type forcing component pushing from the stud side, pressing the ball joint out into the receiver cup. Apply steady pressure, checking alignment frequently. The ball joint should press out gradually. If excessive force is required, verify adapter alignment.
8. 8

   Prepare knuckle bore for new ball joint
   Once old ball joint is removed, thoroughly clean the ball joint bore in the knuckle using a wire brush and brake cleaner. Remove all rust, old grease, and debris. Inspect the bore for damage, cracks, or excessive wear. The bore should be smooth and round. Check that any snap ring groove (if equipped) is clean and undamaged.
9. 9

   Install new lower ball joint
   Verify the new ball joint matches the old one in dimensions and design. If the new ball joint has a snap ring, ensure it is properly seated in its groove on the ball joint body. Position the new ball joint in the knuckle bore, ensuring correct orientation (grease fitting should face outward if equipped). Select the appropriate press adapter that contacts only the outer shell of the new ball joint, not the stud or internal components. Position the receiver cup on the opposite side to support the knuckle. Apply steady pressure with the ball joint press, ensuring the ball joint enters the bore straight and does not cock to one side. Press until the ball joint is fully seated. If equipped with a snap ring on the knuckle side, install it once the ball joint is fully seated.
10. 10

    Reinstall steering knuckle to suspension
    Lift the steering knuckle assembly back into position. Insert the lower ball joint stud into the lower axle yoke mounting hole first. Install the nut on the lower ball joint stud and tighten finger-tight. Next, position the upper ball joint stud into the upper axle yoke mounting hole and install its nut finger-tight. Ensure the front axle is properly supported.
11. 11

    Torque ball joint castle nuts
    Using a torque wrench, torque the lower ball joint nut to factory specification (consult the FSM for this Dana solid front axle, as ball joint nut torque and retention method differ from castle-nut designs). Continue tightening if necessary to align the castle nut slots with the stud cotter pin hole - never loosen to align. Install a new cotter pin and bend the ends to secure. Torque the upper ball joint castle nut to specification, align slots with pin hole, and install new cotter pin.
12. 12

    Reconnect tie rod end
    Insert the tie rod end stud into the steering knuckle. Install the castle nut and torque to specification (typically 45-75 ft-lb depending on tie rod design). Align castle nut slots with cotter pin hole and install new cotter pin.
13. 13

    Reinstall hub and bearing assembly
    Clean the hub mounting surface on the steering knuckle. Position the hub and bearing assembly into the knuckle, aligning the three bolt holes. Install the mounting bolts from the back side and torque to factory specification (verify against the service manual for this heavy-duty axle). If the ABS sensor was removed, reinstall it now.
14. 14

    Reinstall brake rotor and caliper
    Slide the brake rotor onto the hub. Clean the rotor surfaces with brake cleaner. Position the brake caliper over the rotor and align the mounting bolt holes. Install caliper mounting bolts and torque to factory specification (verify against the service manual; caliper bracket bolts are typically far lower than 230 ft-lb). Remove the wire or bungee cord used to support the caliper during the procedure.
15. 15

    Reinstall wheel and lower vehicle
    Mount the wheel and tire assembly onto the hub. Install lug nuts and tighten in a star pattern until snug but not fully torqued. Carefully remove the floor jack from under the lower control arm. Raise vehicle slightly with main hydraulic jack to remove jack stands. Lower vehicle to the ground. Torque wheel lug nuts to factory specification (typically around 145-165 ft-lb for this heavy-duty truck) in a star pattern.

Reassembly

1. Ensure all cotter pins are properly installed and bent to prevent backing out
2. Verify no tools or parts were left in the wheel well area
3. If new ball joint has a grease fitting, pump 3-5 shots of quality chassis grease until fresh grease appears at the boot seal
4. Double-check that all fasteners have been torqued to specification

Verification

• With vehicle on ground, bounce the front end several times and listen for any unusual noises from the suspension
• Visually inspect the ball joint area for proper seating and alignment
• Turn steering wheel lock-to-lock and verify smooth operation with no binding
• Test drive vehicle at low speed in a safe area and verify normal steering feel and no pulling or unusual noises
• Have front end alignment checked and adjusted by a qualified technician immediately after ball joint replacement - this is essential for proper handling and tire wear

More procedures for this vehicle