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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Rear diff grinding?

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Old Sep 28, 2025 | 08:29 PM
  #1  
Owen S.'s Avatar
Owen S.
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Rear diff grinding?

Hey y’all, I’ve just bought a 94 f150 302 4x4. I got her running mint now, only major trouble is when the tires spin or you take a tight turn the rear end or maybe even the trans starts grinding something wicked, and if you keep driving after turning or after spinning the tires a bit the grinding continues until the truck either shifts or until you let back off the gas and get back into it. I think I ruled out it being 1st gear in the trans because putting the shifter down into first so it doesn’t shift and only letting off for a second or two, the grinding will stop and then you can mash the throttle to your hearts content and she won’t make a noise. Checked the diff cover and the diff is NOT a limited slip. It’s an 8.8 Open diff 3.55… any ideas?
 
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Old Sep 29, 2025 | 03:42 AM
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My4Fordtrucks's Avatar
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Does the rear differential tag show it has an open carrier but does it have a locker? You just bought the truck so who knows what the previous owner did? Pull
the cover off the diff and look.
 
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