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Dieseljunky2, Ford Mechanic
Category: Ford
Satisfied Customers: 3946
Experience:  ASE Certified, Ford Certified, Cummins Certified, & 20+ years in field experience
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1998 Ford explorer sport: whining noise in the differential..suv

Resolved Question:

What causes a whining noise in the differential of a 1998 Ford Explorer Sprot SUV with 147000 miles and how can I fix it?
Submitted: 7 years ago.
Category: Ford
Expert:  Dieseljunky2 replied 7 years ago.
The 8.8 inch rear axle assembly in your model truck is notorious for making noise around 100K miles. This is because the gears were not the best in the world to start with. First check the oil level, if it is low, top off with 75W140 SYNTHETIC gear oil. If it is full or still makes noise after it is topped off, your options are, rebuild your current one, or replace it with a used or rebuilt unit. It requires specialized tools to set the bearings in the gear housing, so doing it yourself, may not be the soundest (no fun intinded) decision. Installing a used unit is a gamble, but the cheapest route. Installing a reman unit is the most expensive, but best route to go. You could also bring your truck to a repair shop and have them rebuild your current unit.
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