Subframe Bushing

Replace worn subframe bushings on the front suspension subframe to restore proper alignment and reduce noise, vibration, and handling issues.

Warnings

Tools required

Parts

• Subframe bushing set (4 bushings) × 1 — Use OEM specification or Moog K200896/K200897
• Subframe mounting bolts (if corroded) × 4 — Use OEM specification

Preparation

1. Park vehicle on level, solid ground and engage parking brake
2. Place wheel chocks behind rear wheels
3. Disconnect negative battery cable
4. Raise front of vehicle and support frame rails on jack stands behind the subframe mounting points
5. Remove both front wheels
6. Spray all subframe mounting bolts, steering linkage nuts, and control arm bolts with penetrating oil
7. Mark alignment cam positions on control arms with paint or scribe marks for reference during reassembly

Procedure

1. 1

   Disconnect steering linkage
   Remove cotter pins and loosen castle nuts on both outer tie rod ends. Use a ball joint separator or pickle fork to separate tie rod ends from steering knuckles. Support the steering linkage with wire or zip ties to prevent damage to boots.
2. 2

   Disconnect sway bar links
   Remove upper sway bar link nuts from both sides using a wrench to hold the ball stud while removing the nut. Disconnect sway bar end links from the control arms or sway bar, whichever provides better clearance.
3. 3

   Disconnect front shock absorbers
   Remove the lower shock mounting bolts on both sides. Allow shocks to hang from upper mounts. This provides clearance for subframe lowering.
4. 4

   Support front differential and remove mounting bolts
   Place a transmission jack or hydraulic jack under the front differential assembly. Remove the front differential mounting bolts that attach to the subframe. Lower the differential slightly but keep it supported to prevent strain on the front axle shafts and driveshaft.
5. 5

   Disconnect brake line brackets
   Remove any brake line or ABS sensor wire brackets attached to the subframe. Allow lines to hang free with enough slack to permit subframe lowering. Do not disconnect brake lines.
6. 6

   Support subframe with transmission jack
   Position a transmission jack or large hydraulic jack with a block of wood centered under the subframe. Raise jack until it just contacts the subframe with light pressure. Ensure the subframe is stable and balanced on the jack.
7. 7

   Remove subframe mounting bolts
   Remove all four subframe-to-frame mounting bolts. There are two bolts on each side mounting the subframe to the main frame rails. These are large bolts that may require a breaker bar. Have an assistant help stabilize the subframe during removal of the final bolt.
   ⚠️Ensure transmission jack is securely supporting subframe before removing final mounting bolt. Subframe weighs over 200 lbs with control arms attached.
8. 8

   Lower subframe
   Slowly and carefully lower the transmission jack to bring the subframe down from the frame rails. Lower only enough to access the bushing mounting points. Check for any hung-up wiring, brake lines, or other components as you lower. Typically lowering 6-8 inches is sufficient.
9. 9

   Remove old bushings
   Inspect the four subframe bushing locations (two per side). If bushings are pressed into the subframe, use a bushing press kit or hydraulic press with appropriate adapters to press out the old bushings. If bushings are in separate brackets, remove the brackets from the frame and press bushings out on workbench. Clean all bushing bores with a wire brush and inspect for damage.
10. 10

    Install new bushings
    Apply a thin film of dish soap or bushing installation lubricant (never grease or oil) to the outer diameter of new bushings. Press new bushings into subframe or brackets using bushing press, ensuring bushings are fully seated and oriented correctly (voids in bushings should align with vehicle fore-aft direction). Ensure bushings are pressed in straight to avoid damage.
11. 11

    Raise subframe into position
    Slowly raise the transmission jack to lift the subframe back up to the frame rails. Align the bushing mounting points with the frame rail mounting holes. Use a pry bar if needed to align holes. Insert all four subframe mounting bolts finger-tight before tightening any bolts.
12. 12

    Torque subframe mounting bolts
    Tighten all four subframe mounting bolts in a cross pattern. Since specific torque values are not available in the database, consult a factory service manual for exact specifications. Torque values are not available in this database. Do not use any assumed value; obtain the exact torque specification (and any torque-angle sequence) from the factory service manual before final tightening. Apply anti-seize to bolt threads if replacing bolts.
13. 13

    Reconnect front differential
    Raise the front differential back into position and install the differential mounting bolts to the subframe. Torque differential mounting bolts per service manual specifications. Remove the transmission jack from under the differential.
14. 14

    Reconnect suspension and steering components
    Reinstall lower shock mounting bolts. Reconnect sway bar end links and tighten nuts. Reconnect tie rod ends to steering knuckles, tighten castle nuts, and install new cotter pins. Reattach all brake line and ABS sensor wire brackets to subframe.

Reassembly

1. Install front wheels and torque lug nuts in star pattern to manufacturer specification (typically 135 ft-lbs for Ram 3500)
2. Lower vehicle from jack stands
3. Reconnect negative battery cable
4. Bounce front suspension several times to settle new bushings before final verification

Verification

• Start engine and turn steering wheel full lock to lock while stationary to verify no binding or interference
• Test drive vehicle at low speed in safe area and verify no unusual noises, vibrations, or steering concerns
• Schedule professional four-wheel alignment immediately, as subframe removal will affect alignment settings
• After first 50-100 miles, recheck all subframe mounting bolt torque to ensure nothing has loosened
• Inspect for any fluid leaks around differential or steering components that may have been disturbed

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