No faith in RTV of any color. Cure time is too long. NOBODY is gonna wait 24 hrs . Permatex #2 Aviation has a 15 min "skin" time and is way more forgiving because its non hardening
My Ford/Lincoln Front Differential Leak Experience
- Thread starter Navi
- Start date
You don’t need a leak to have a differential problem in those vehicles. Our 2020 Ford Expedition was just diagnosed with bad pinion bearings, and the gear oil was still at the correct level (and full of silver glitter).
You also need to realize that the Auto4WD versions of these drivetrains spin the front differential all the time. Manual 4WD does not. Expeditions, Navigators and Lariat (and above) F150s all have the Auto4WD transfer cases that need to engage the front axle when slippage occurs. Lower end XLTs don't have the auto 4WD and disconnect at the wheels (IWEs) and at the transfer case...so the differential doesn't turn at all unless manually set for 4HI or 4LO.
Good to know. To be clear, I was referring to the front differential in our Expedition needing new pinion bearings. I changed the gear oil on the front differential at 36k to be proactive, and by 112k the pinion bearings were shot.
Yeah there's no excuse for that, and spinning full time is irrelevant. First, it's just an idler most of the time and secondly rear diffs spin 100% of the time and manage to live 300k+ miles regularly.
Back when trucks were trucks you could drive around indefinitely with no rear d/s in 4wd. A D44, 10b or D60 front axle didn't much care.
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