Symptoms
No record of hub service, weeping at a hub, metal on a drain plug magnet.
The fix, step by step
- Drain and refill the six portal hubs, three axle differentials and the transfer case with the specified oils, cleaning every magnetic plug.
- Investigate any weeping hub before it reaches the brakes.
Tools & part numbers
- Hex and Torx sockets
- fluid pump
- drain pans
- new crush washers
Where to buy the parts
Red Line 75W-90 GL-5 gear oil (1 qt)FCP Euro ↗Amazon ↗
Genuine Mercedes differential drain plug 901 997 05 35FCP Euro ↗Amazon ↗
GwagenParts.com search: portal axleGwagenParts.com ↗
Hunting a used or discontinued part? Search eBay Motors for Mercedes-Benz G 63 AMG 6×6 parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.