Rear diff. fluid question
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Elder User
Joined: Aug 2004
Posts: 586
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From: Schwenksville,Pa
Rear diff. fluid question
The manual says to use 80w-90 gear oil in the rear differential but the tag bolted to the rear says to use 75w-140 synthetic gear lube only. I think I can special order Redline at my local auto parts store. anyone know why the discrepancy and which lube to use in my 2000 expy with 3.55 limited slip rear?
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Joined: Nov 2003
Posts: 3
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It's definitely synthetic, go with Motorcraft if you can. Also check with your dealer to verify if you need the Friction Modifier, otherwise your rear will vibrate like crazy.
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Senior User
Joined: Aug 2003
Posts: 149
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Go with the tag...definitely...just changed the fluid in mine and I went with the Redline and their friction modifier...much much cheaper than the Ford dealership ($26 qt/dealer vs $8/qt Redline) and Redline is a very reputable manufacturer.
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Junior User
Joined: Feb 2004
Posts: 81
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From: Washingtonville, NY
rear fluid
Ford replaced the fluid with synthetic after the TSB was done for the LS chatter in turns. I would go with the synthetic from Ford just to make sure there isn't any warranty issues. I've already had the clutch pack and gears replaced in mine. 2 separate problems.