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?
New User
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.