After Repairing the emergency brake system in the 2001 Ford F350 truck, I had to top off the differential fluid in the rear end of the truck. This truck has a 10.5 inch sterling rear end. When I popped off the fluid with what the dealer had sold me a year and a half ago approximately, I noticed it was not what the manual calls for.

It seems that the Ford dealership sold me the wrong rear Differential fluid last time. So they worked with me on the price so I bought new 75w 140 full synthetic Plus, a friction modifier. 

Let’s Hope there is no damage to the truck in the last year and a half. This is an easy maintenance job to do.