New member here.
My truck:
2003 Ford F-350, XLT, 4X2; 6.8L; 4R100
80K miles
Towing travel trailer and boats (3K-8K) several times per year...distances between 50 miles and 2000 miles
Preparing for a rear differential service. My rear axle tags are as follows; it is a Ford axle:
10.5"; 3.73, Limited Slip
75W140 Synthetic Oil Only
Most gear oils claim to have "friction modifiers for limited slip applications" (ex. Amsoil, and Motorcraft).
Do these gear oils contain the sufficient amount required and is it of the appropriate type for the Ford 10.5" LS axle?
Should the Motorcraft XL-3 Addtitive Friction modifier be added, regardless of whether the oil contains it or not?
My manual states to use 8oz. of Motorcraft XL-3 additive (two 4oz bottles).
Is too much additive going to cause adverse reactions, considering most oils have it in them already?
What gear oils are you using?
I use Motorcraft in engine oil and Motorcraft in trans fluid.
I read several threads/posts (here and other Ford forums) where it appears most are not using Motorcraft, but are using....Amsoil, Mobil 1, Red Line, Royal Purple, and a few others.
Any reason Motorcraft is not too popular?
Thanks!
My truck:
2003 Ford F-350, XLT, 4X2; 6.8L; 4R100
80K miles
Towing travel trailer and boats (3K-8K) several times per year...distances between 50 miles and 2000 miles
Preparing for a rear differential service. My rear axle tags are as follows; it is a Ford axle:
10.5"; 3.73, Limited Slip
75W140 Synthetic Oil Only
Most gear oils claim to have "friction modifiers for limited slip applications" (ex. Amsoil, and Motorcraft).
Do these gear oils contain the sufficient amount required and is it of the appropriate type for the Ford 10.5" LS axle?
Should the Motorcraft XL-3 Addtitive Friction modifier be added, regardless of whether the oil contains it or not?
My manual states to use 8oz. of Motorcraft XL-3 additive (two 4oz bottles).
Is too much additive going to cause adverse reactions, considering most oils have it in them already?
What gear oils are you using?
I use Motorcraft in engine oil and Motorcraft in trans fluid.
I read several threads/posts (here and other Ford forums) where it appears most are not using Motorcraft, but are using....Amsoil, Mobil 1, Red Line, Royal Purple, and a few others.
Any reason Motorcraft is not too popular?
Thanks!