Symptoms
Oil drips at the front of either differential or at the transfer-case outputs; oil spray on the driveshafts.
The fix, step by step
- First make sure the axle breather tube isn't kinked or blocked, because pressure pushes oil past seals.
- Pinion seals need care: an MBWorld member notes the pinion bearing preload is set by a crush sleeve, so mark and measure before removing the nut.
- For transfer-case output seals, refill with Mercedes-approved fluid and check the flanges for wear.
Tools & part numbers
- Flange holding tool
- seal puller
- inch-pound torque wrench
- fluids
Where to buy the parts
Genuine Mercedes transfer case input shaft seal 015 997 08 47FCP Euro ↗Amazon ↗
Genuine Mercedes differential drain plug 901 997 05 35FCP Euro ↗Amazon ↗
GwagenParts.com search: g63 sealGwagenParts.com ↗
Hunting a used or discontinued part? Search eBay Motors for Mercedes-Benz G 63 AMG 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.