F/R Diff Question
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From: California
F/R Diff Question
Does the F-250/350's front & rear diffs have a gasket on the cover or just goop or both? Looking to change out the factory gear oil w/ fresh stuff. Also I see the front Dana 60 usues 80/90 gear synth, but would it hurt to put 75/90 synth gear weight? I know 75/140 synth in the rear.
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Silicone is all I have ever used, never seen a gasket on one but I havent torn in to the 08 yet.
I have used the 75w140 before. Didnt think about the warranty because it was a certified gear oil. I "think" so long as you dont use something like ATF or 5w30 in them you are probably OK. Thats my opinion, not necessarily a fact but then again I use 5W40 synthetic oil which my manual doesnt cover. Ford sells 5W40 synthetic, it meets the rating, etc but its not in the manual.
I have used the 75w140 before. Didnt think about the warranty because it was a certified gear oil. I "think" so long as you dont use something like ATF or 5w30 in them you are probably OK. Thats my opinion, not necessarily a fact but then again I use 5W40 synthetic oil which my manual doesnt cover. Ford sells 5W40 synthetic, it meets the rating, etc but its not in the manual.
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From: Frederick, MD
When using the friction modifier for the LS axle, I have heard that you take it real easy and give it a test drive to ensure you don't use to much and ruin the effects of the LS system.
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I will use 75/90w Amsoil in the front (since I have some left over from my Dodge CTD) and keep the 75/140 in the rear like the maintenance book states. Even though I've run Amsoil newer 75/110 that works great for an in between 90 & 140 wieght.
Sucks that Ford does not use a reusable gasket for the diff covers. Makes things easier like my Dodge when changing the diffs.
Sucks that Ford does not use a reusable gasket for the diff covers. Makes things easier like my Dodge when changing the diffs.
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