Idler Arm

Replace the idler arm on the steering linkage to restore proper steering geometry and eliminate play in the front suspension.

Warnings

Tools required

Parts

• Idler arm assembly × 1 — Moog K6696 or equivalent
• Idler arm mounting bolts (if corroded) × 3 — Use OEM specification
• Castle nut (if not included with idler arm) × 1 — Use OEM specification
• Cotter pin × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and apply parking brake
2. Place wheel chocks behind rear wheels
3. Spray penetrating oil on idler arm castle nut, center link taper, and frame mounting bolts
4. Raise front of vehicle with floor jack at frame rail
5. Support vehicle securely on jack stands at manufacturer lift points
6. Remove driver side front wheel using 22mm socket

Procedure

1. 1

   Access the idler arm
   Locate the idler arm on the passenger side of the vehicle, mounted to the frame rail and connected to the steering linkage (verify against your specific steering configuration, as HD Ram trucks vary). Clean the area around the castle nut, center link connection, and frame mounting bolts with a wire brush to remove dirt and corrosion.
2. 2

   Remove castle nut cotter pin
   Straighten and remove the cotter pin from the castle nut that secures the idler arm to the center link. Use pliers to fully extract the pin. Discard the old cotter pin.
3. 3

   Remove idler arm castle nut
   Using the correct size socket (verify against fastener), remove the castle nut from the idler arm stud. Keep this nut if it is in good condition and the replacement idler arm did not include a new one. Note the thread condition on the stud.
4. 4

   Separate idler arm from center link
   Use a pickle fork or tie rod separator to break the taper fit between the idler arm stud and center link. Insert the tool between the center link and idler arm mounting point and strike with a hammer until the taper releases. Alternatively, use a ball joint separator tool for cleaner removal. The idler arm will drop down once separated.
5. 5

   Remove idler arm mounting bolts
   Locate the bolts securing the idler arm bracket to the frame rail (verify count). Using the correct size socket and breaker bar if needed, remove all mounting bolts. Support the idler arm assembly as you remove the final bolt to prevent it from falling.
6. 6

   Remove idler arm assembly
   Pull the idler arm assembly away from the frame rail and out of the vehicle. Inspect the frame mounting surface for corrosion or damage. Clean the mounting surface with a wire brush if necessary.
7. 7

   Prepare new idler arm
   Compare the new idler arm to the old unit to verify correct replacement part. Check that all mounting holes align and the stud length matches. Ensure the new idler arm includes grease fitting if applicable and verify it moves freely through its range of motion.
8. 8

   Install new idler arm to frame
   Position the new idler arm bracket against the frame rail, aligning all three mounting holes. Install the three mounting bolts finger-tight. Do not fully torque at this stage to allow for alignment adjustment.
9. 9

   Connect idler arm to center link
   Raise the idler arm stud into the center link taper hole. Ensure the stud seats properly and is centered in the hole. Install the castle nut onto the stud and tighten by hand until snug.
10. 10

    Torque castle nut
    Tighten the castle nut to proper specification per manufacturer guidelines (verify exact torque value against OEM service manual for this application). Tighten only enough to align the castle nut slots with the cotter pin hole in the stud. Do not back off the nut to align; if needed, tighten slightly more to next slot alignment.
11. 11

    Install new cotter pin
    Insert a new cotter pin through the castle nut slots and stud hole. Bend the ends of the cotter pin in opposite directions to secure. Ensure the cotter pin cannot work loose during operation.
12. 12

    Torque frame mounting bolts
    Using a torque wrench, tighten the idler arm frame mounting bolts (verify count) to manufacturer specification (verify exact torque value against OEM service manual). Verify all bolts are fully seated and torqued properly.
13. 13

    Lubricate grease fitting
    If the new idler arm has a grease fitting, pump chassis grease into the fitting using a grease gun until fresh grease appears at the boot seal. Wipe away excess grease.

Reassembly

1. Reinstall driver side front wheel and torque lug nuts to 135 ft-lbs in a star pattern
2. Lower vehicle from jack stands
3. Bounce the front end several times to settle the suspension
4. Recheck all fasteners for proper torque after vehicle is on the ground

Verification

• Start engine and turn steering wheel full lock in both directions to verify no binding or interference
• Check for any abnormal noises from the steering linkage during operation
• Verify the idler arm has no vertical or horizontal play when manually tested
• Test drive vehicle at low speed in a safe area to confirm steering operation
• Schedule a professional four-wheel alignment immediately after repair - this is mandatory for proper vehicle handling and tire wear

More procedures for this vehicle