Complete disassembly, inspection, and rebuild of the front electric drive unit differential, including bearing replacement, seal installation, and gear setup for the 2022 Rivian EDV 500.

Warnings

Tools required

Parts

• Front differential bearing kit (includes pinion and carrier bearings) × 1 — Use OEM specification
• Pinion seal × 1 — Use OEM specification
• Differential cover gasket or RTV sealant × 1 — Use OEM specification
• Pinion nut × 1 — Use OEM specification - one-time use
• Shim kit for pinion depth and bearing preload × 1 — Use OEM specification
• Ring gear bolts × 1 — Use OEM specification - one-time use
• Differential side gear thrust washers (if worn) × 1 — Use OEM specification
• Crush sleeve or preload shims × 1 — Use OEM specification - verify vehicle setup

Fluids

• 75W-90 GL-5 Gear Oil — 2 qt

Preparation

1. Verify high voltage system is disconnected and locked out per manufacturer safety procedures
2. Raise vehicle on lift and secure at designated lift points
3. Remove front wheels
4. Support front drive unit with transmission jack
5. Disconnect front halfshafts from drive unit
6. Disconnect electrical connectors from motor and sensors
7. Disconnect coolant lines from drive unit and plug openings
8. Remove front drive unit mounting bolts and lower unit onto workbench
9. Clean exterior of drive unit thoroughly
10. Position drive unit in suitable holding fixture on workbench
11. Photograph assembly before disassembly for reference

Procedure

1. 1

   Drain differential and remove cover
   Position drain pan under differential housing. Remove drain plug and allow 75W-90 gear oil to fully drain. Remove differential cover bolts in criss-cross pattern. Carefully separate cover from housing using plastic dead blow hammer if needed. Inspect drained fluid for metal particles or contamination indicating wear or damage.
2. 2

   Mark and measure gear pattern
   Before disassembly, paint 3-4 ring gear teeth with gear marking compound. Rotate pinion through several revolutions while applying resistance to carrier. Photograph contact pattern on both drive and coast sides for reference during reassembly. Measure and record ring gear backlash at 4 points around the ring gear using dial indicator. Record readings for comparison during reassembly.
3. 3

   Remove differential carrier assembly
   Remove carrier bearing cap bolts and mark caps for proper reinstallation orientation. Install differential spreader tool on housing and carefully spread housing just enough to remove carrier (typically 0.010 inches maximum). Do not over-spread housing. Lift carrier assembly with ring gear out of housing. Remove spreader tool immediately. Mark carrier bearing shims and note their location and thickness for reference.
4. 4

   Disassemble carrier assembly
   Secure ring gear and carrier assembly in soft-jawed vise. Remove ring gear bolts (left-hand thread on some designs - verify before removal). Separate ring gear from carrier using plastic hammer if necessary. Drive out differential pinion shaft roll pin. Remove pinion shaft, pinion gears, side gears, and thrust washers. Inspect all components for wear, scoring, or damage. Measure thrust washer thickness and record.
5. 5

   Remove carrier bearings
   Using bearing puller, carefully remove carrier bearings from both sides of carrier housing. Inspect bearing races in housing for wear or damage. Mark bearing shim locations and thicknesses. If races need replacement, use appropriate driver to remove and install new races, ensuring they are fully seated.
6. 6

   Remove pinion gear assembly
   Hold pinion flange with appropriate tool and remove pinion nut (note: this is a one-time use fastener). Mark pinion flange orientation to pinion shaft. Use appropriate puller to remove flange from pinion shaft. Carefully drive pinion shaft out of housing from front. Catch pinion gear and prevent it from falling. Remove pinion rear bearing, collapsible spacer or shim pack, and front bearing from pinion shaft using press or bearing separator.
7. 7

   Remove and inspect pinion races and seal
   Drive out pinion front and rear bearing races from housing using appropriate drift punch. Remove and discard pinion seal from front of housing. Thoroughly clean all bearing bores in housing. Inspect housing for cracks, scoring, or damage. Clean all components with solvent and dry with compressed air.
8. 8

   Install new pinion races and measure depth
   Using bearing race driver, install new pinion front and rear bearing races into housing, ensuring they are fully seated. Use pinion depth gauge tool to determine correct shim thickness needed for proper pinion depth. Install appropriate shim on pinion shaft. This is critical for proper gear tooth contact pattern.
9. 9

   Assemble and install pinion
   Press pinion rear bearing onto pinion shaft against depth shim. Install new collapsible spacer or shim pack onto pinion shaft. Press front bearing onto pinion shaft. Insert pinion assembly into housing from rear. Install new pinion seal using seal driver, ensuring proper depth and alignment. Lubricate seal lip with gear oil. Install pinion flange in original orientation.
10. 10

    Set pinion bearing preload
    Install new pinion nut and tighten in stages while checking rotating torque with inch-pound torque wrench. Target preload is typically 15-25 inch-pounds for new bearings (verify specification). If using collapsible spacer, once proper preload is reached, do not back off nut - this requires complete reassembly with new spacer. If using shim pack, adjust shim thickness to achieve proper preload. Record final pinion nut torque and rotating torque.
11. 11

    Reassemble differential carrier
    Install side gears and thrust washers into carrier. Install pinion gears and rotate to align with pinion shaft holes. Insert pinion shaft and install new roll pin, ensuring it is fully seated and properly staked. Verify side gear endplay is within specification using feeler gauge. Place ring gear on carrier ensuring proper alignment. Install new ring gear bolts with thread locker and tighten in criss-cross pattern to specification.
12. 12

    Install carrier bearings and set backlash
    Press new carrier bearings onto carrier. Install shims on both sides of carrier (start with original thickness). Install carrier assembly into housing using spreader tool. Install bearing caps in original orientation. Remove spreader and tighten bearing cap bolts to specification. Mount dial indicator to measure ring gear backlash. Adjust shim thickness to achieve proper backlash (typically 0.005-0.008 inches). Increase shim thickness on ring gear side to decrease backlash, decrease to increase backlash. Ensure backlash is consistent at all measurement points around ring gear.
13. 13

    Check and verify gear tooth contact pattern
    Apply fresh gear marking compound to several ring gear teeth. Rotate pinion through several complete revolutions while applying resistance. Examine contact pattern on both drive and coast sides. Pattern should be centered on tooth face with slight bias toward toe. Adjust pinion depth shims if pattern is too high or low on tooth. Adjust backlash if pattern is too far toward toe or heel. Repeat measurement and adjustment until proper pattern is achieved.
14. 14

    Install differential cover and fill with fluid
    Clean all gasket surfaces thoroughly. Install new gasket or apply RTV sealant in continuous bead to cover. Install cover and tighten bolts in criss-cross pattern to specification. Install and tighten drain plug. Fill differential with 1.5 quarts of 75W-90 GL-5 gear oil through fill hole. Allow oil to settle and verify level is at bottom of fill hole. Install fill plug and tighten to specification.
15. 15

    Final inspection and drive unit reinstallation
    Rotate pinion by hand and verify smooth operation with no binding or unusual noise. Verify all fasteners are tightened to specification. Clean exterior of drive unit. Reinstall drive unit into vehicle following reverse of removal procedure. Reconnect halfshafts, electrical connectors, and coolant lines. Torque all mounting fasteners to specification. Reinstall wheels and lower vehicle.

Reassembly

1. Ensure all bearing preload and backlash specifications are met before final assembly
2. Verify gear tooth contact pattern is correct before installing differential cover
3. Use new one-time-use fasteners including pinion nut and ring gear bolts
4. Apply medium-strength thread locker to all fasteners unless otherwise specified
5. Ensure all electrical connectors are properly seated and locked
6. Verify coolant lines are properly connected and secured with new clamps if needed
7. Torque all fasteners to manufacturer specifications using proper sequence

Verification

• Reconnect high voltage battery system following proper procedures
• Start vehicle and verify no warning lights or fault codes related to front drive unit
• Perform initial test drive at low speed, listening for unusual noises from front differential
• Check for fluid leaks around differential cover, pinion seal, and drain plug
• Perform full function test including acceleration, deceleration, and turning at various speeds
• Verify smooth operation with no vibration, noise, or binding during all drive modes
• Re-check differential fluid level after test drive and top off if necessary
• Scan for diagnostic trouble codes and verify all drive unit systems are functioning properly
• Schedule follow-up inspection after 500 miles to verify no leaks and proper operation

More procedures for this vehicle