Torsion Bar

This procedure covers the removal and replacement of the torsion bar assembly on a 2023 Rivian EDV 500 electric delivery van.

Warnings

Tools required

Parts

• Torsion bar assembly × 1 — Use OEM specification
• Torsion bar adjuster bolt × 1 — Use OEM specification
• Torsion bar mounting hardware kit × 1 — Use OEM specification

Preparation

1. Place vehicle on level surface and engage parking brake
2. Disconnect 12V auxiliary battery negative terminal and wait 2 minutes
3. Raise vehicle on lift or jack stands to working height with wheels hanging free
4. Remove front wheels on the side being serviced
5. Spray torsion bar adjustment bolt and mounting hardware with penetrating oil and allow to soak for 15 minutes
6. Photograph or document current ride height measurement from ground to fender lip for reference

Procedure

1. 1

   Mark torsion bar adjustment position
   Using paint marker or scribe, mark the exact position of the torsion bar adjustment bolt relative to the adjustment nut. Count and record the number of exposed threads on the adjustment bolt. Measure and record the distance from the adjustment nut to the crossmember reference point. Take multiple reference marks to ensure accurate reinstallation.
2. 2

   Measure and record ride height
   With vehicle at rest on lift, measure from ground to center of wheel hub and from ground to bottom of frame rail at multiple points. Record all measurements. Measure the angle of the lower control arm relative to horizontal using digital angle meter. These measurements are critical for post-installation verification.
3. 3

   Relieve torsion bar tension
   Install torsion bar unloading tool onto the adjustment bolt according to tool manufacturer instructions. Slowly turn the unloading tool to transfer load from the adjustment bolt to the tool. Once tool is supporting full load, carefully remove the adjustment bolt and nut. Continue using unloading tool to slowly release torsion bar tension in controlled manner until bar is fully unloaded.
   ⚠️Release tension slowly and maintain control of the unloading tool at all times. Rapid release can cause tool failure or bar displacement.
4. 4

   Mark torsion bar orientation
   Before removing torsion bar, use paint marker to mark the orientation of the torsion bar relative to the lower control arm anchor and the crossmember anchor. Mark both ends with corresponding index marks (front/rear orientation). The torsion bar has specific clocking and cannot be installed backwards or rotated.
5. 5

   Disconnect torsion bar from lower control arm
   Remove the retaining clip or bolt securing the torsion bar to the lower control arm anchor point. Note the position of any shims or spacers. Using a rubber mallet, carefully tap the torsion bar to break it free from the control arm splines. If bar is seized, apply additional penetrating oil and allow time to soak.
6. 6

   Remove torsion bar from crossmember
   At the rear crossmember mount, remove the retaining hardware securing the torsion bar adjuster assembly. Note position of all washers, bushings, and support brackets. Carefully slide the torsion bar rearward out of the lower control arm and then remove from the crossmember mount. Support the bar during removal to prevent dropping.
7. 7

   Inspect mounting points
   Clean the lower control arm anchor and crossmember anchor splines with wire brush. Inspect splines for wear, damage, or deformation. Check adjustment bolt threads for damage. Inspect crossmember mounting area for cracks or corrosion. Replace any damaged components before installing new torsion bar.
8. 8

   Install new torsion bar into crossmember
   Apply light coating of anti-seize compound to torsion bar splines at both ends. Insert rear end of new torsion bar into crossmember anchor, aligning splines according to manufacturer markings. Install support brackets and retaining hardware finger-tight. Verify bar is fully seated in crossmember mount.
9. 9

   Connect torsion bar to lower control arm
   Align the front end of torsion bar with lower control arm anchor, matching orientation marks to factory specifications. The bar will need to be rotated to align splines. Slide bar forward into control arm anchor until fully seated. Install retaining clip or bolt and any shims in original positions.
10. 10

    Install adjustment mechanism
    Install adjustment bolt and nut into crossmember mount. Thread bolt in to approximately the marked position recorded during disassembly, counting threads to match original setting. Do not fully tighten yet. Ensure adjustment mechanism moves freely and is properly aligned.
11. 11

    Preload torsion bar
    Install torsion bar loading tool onto adjustment bolt. Gradually apply tension to torsion bar by turning loading tool, bringing bar to approximately 80% of original preload. Monitor control arm position and verify bar is seating properly in both anchor points as tension is applied. Once preload is established, fine-tune adjustment bolt to match original reference marks.
12. 12

    Torque all mounting hardware
    Working from the crossmember forward, torque all torsion bar mounting hardware. Since specific torque values are not available in the database, refer to vehicle service manual for manufacturer specifications. Typical sequence: crossmember mounting bolts, then control arm retaining hardware, then adjustment bolt lock nut. Verify all fasteners are properly secured.
    ℹ️Manufacturer torque specifications must be obtained from official Rivian service documentation for this critical suspension component.
13. 13

    Remove loading tool and verify preload
    Carefully remove torsion bar loading tool while monitoring adjustment bolt remains in position. Verify lock nut is secure. Check that control arm angle matches pre-removal measurement using digital angle meter. Minor adjustments can be made by turning adjustment bolt to achieve correct ride height position.

Reassembly

1. Reinstall front wheels and torque lug nuts to specification
2. Lower vehicle to ground with full weight on suspension
3. Reconnect 12V auxiliary battery negative terminal
4. Bounce front suspension several times to settle components
5. Re-measure ride height at all previously documented points and compare to pre-removal measurements

Verification

• Verify ride height matches original measurements within 10mm at all measurement points
• Check that vehicle sits level side-to-side with no visible lean
• Test drive vehicle and verify suspension operates normally without unusual noises or handling characteristics
• Perform alignment check to ensure torsion bar adjustment has not affected toe or camber beyond specification
• Inspect all mounting hardware for proper torque and verify no looseness after test drive
• If ride height is not within specification, adjust torsion bar bolt incrementally and re-measure until correct height is achieved

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