ilvtravln
Calif.
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Joined: 03/22/2005
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Grit dog wrote:How often? Now. If it’s 20 year old oil. That said once I do an early diff change on a new or new to me vehicle, I go at least 50k between changes with good synthetic gear lube.
PS, if it’s an early 03 7.3 you have a very desirable vehicle if it’s been kept up and basically used only rarely.
Its a 7.3, well kept.
Art
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larry barnhart
wenatchee. wa usa
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Our 05 chev dually with 116000 miles has had the rear diff changed 13 times. so easy to do I decided to overkill as I do on every fluid for this truck. chevman retired from Rving
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Grit dog
Black Diamond, WA
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larry barnhart wrote:Our 05 chev dually with 116000 miles has had the rear diff changed 13 times. so easy to do I decided to overkill as I do on every fluid for this truck. chevman retired from Rving
Lol, I’d love to have the $1000 worth of used oil outta that truck.
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FishOnOne
The Great State of Texas
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I have a '12 Super Duty with the same rear end with ~260k miles. The rear diff fluid has been changed once to date and is dry as a bone so no leaks. Probably need to do it again.
In your case probably every 100k miles is good if there's no leaks.
'12 Ford Super Duty FX4 ELD CC 6.7 PSD 400HP 800ft/lbs "270k Miles"
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larry barnhart
wenatchee. wa usa
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Grit dog wrote:larry barnhart wrote:Our 05 chev dually with 116000 miles has had the rear diff changed 13 times. so easy to do I decided to overkill as I do on every fluid for this truck. chevman retired from Rving
Lol, I’d love to have the $1000 worth of used oil outta that truck. Probably closer to $700.00. no labor spent a lot more on the overkill fluid changes but with 116K mores it does run awesome. Looks great sitting in our garage. chevman retired from rving. "Don't frown because it is over but smile because it happened"
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mosseater
Dillsburg, PA
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2007 F-150 sig pic had about 170K miles, daily driver and towing. I changed it because the diff cover was showing signs of rusting through. Fluid was dirty of course, but no obvious shiny chunks. Gears looked like brand new.
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1320Fastback
Vista, Ca
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As a person who just dropped $2,440 on a rear end rebuild I'd do it now. My oil was last changed by myself around 5 years ago and now wish I'd done it more regularly. Oil is cheap comparably.
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wnjj
Cornelius, Oregon
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1320Fastback wrote:As a person who just dropped $2,440 on a rear end rebuild I'd do it now. My oil was last changed by myself around 5 years ago and now wish I'd done it more regularly. Oil is cheap comparably.
While that's true, it's also no guarantee that your rear end wouldn't have failed even with fresher oil.
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JRscooby
Indepmo
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wnjj wrote:1320Fastback wrote:As a person who just dropped $2,440 on a rear end rebuild I'd do it now. My oil was last changed by myself around 5 years ago and now wish I'd done it more regularly. Oil is cheap comparably.
While that's true, it's also no guarantee that your rear end wouldn't have failed even with fresher oil.
Can't see the differential, so can't say for sure. But what I can say is that in my trucks, changing the diff oil at recommended time made temps run lower. (Transmission made more change).
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fj12ryder
Platte City, MO
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1320Fastback wrote:As a person who just dropped $2,440 on a rear end rebuild I'd do it now. My oil was last changed by myself around 5 years ago and now wish I'd done it more regularly. Oil is cheap comparably. Well, if it was the oil, it would be about the first time I've heard of not-that-old-oil causing a differential failure. More likely not the oil that caused the failure.
Howard and Peggy
"Don't Panic"
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