my Toyota RAV4 XA40 (2013-2018) rear differential is whining what should I do

Solution

1. Preparation

• Tools Required: Jack stands, wheel chocks, socket set, torque wrench, drain pan, funnel, OBD-II scanner.
• Safety Warnings: Ensure the vehicle is on a level surface and securely supported on jack stands before beginning work.

2. Fluid Change

1. Drain Old Fluid:
   • Place the drain pan under the differential.
   • Remove the drain plug and allow the fluid to completely drain out.
2. Inspect Drain Plug:
   • Clean the drain plug and inspect for metal shavings or debris which could indicate internal wear.
3. Replace with New Fluid:
   • Reinstall the drain plug and torque it to the manufacturer’s specifications (usually around 30 ft-lbs for Toyota differentials).
   • Remove the fill plug and use a funnel to fill the differential with new gear oil (check the owner’s manual for the specific type and capacity, typically 75W-90 or 80W-90).
   • Reinstall the fill plug.

3. Component Inspection

1. Remove Differential Cover (if needed):
   • If the noise persists after fluid change, consider removing the differential cover for internal inspection.
   • Remove the cover bolts and gently pry it off, taking care not to damage the gasket.
2. Inspect Gears and Bearings:
   • Inspect the ring and pinion gears for wear or damage.
   • Check the condition of carrier bearings and side bearings for smooth rotation.
3. Replace Worn Components:
   • If any components are found to be damaged or worn, replace them with OEM parts.
   • Reassemble the differential with a new gasket or sealant as required.