Friction Modifier Questions... - Ford Powerstroke Diesel Forum
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Old 01-06-2008, 11:57 AM
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Friction Modifier Questions...

My 2000 F-350 DRW Dana 80 axle had the infamous "chatter" when making tight turns.I changed my oil to synthetic Royal Purple 75W-90.It supposedly has limited slip additive already in it.Still had the chatter.So,i added a 7 ounce bottle of Trans-X Limited Slip Friction Modifier to the oil.My chatter seems to have cleared up.If the rear end oil is oversaturated with limited slip additive,would i know it?What would be the signs?Thanks everyone.
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Old 01-06-2008, 12:04 PM
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I used synthetic in something else that supposed to have the modifier in it, plus I added the trans-x too. I haven't had any issues in over a year.

I would have used the 140 weight and not the 90.
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Old 01-06-2008, 12:41 PM
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I started to use 75W-140.Then i ran across Ford TSB 04-16-4 dated 7/30/04 that recommended 75W-90 for the Dana 80.
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Old 01-06-2008, 12:42 PM
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Sounds cool
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