98 F250 L/D Diff Chatter
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98 F250 L/D Diff Chatter
<TABLE><TBODY><TR><TD vAlign=top width="100%">I can only feel this chatter when Im pulling my trailer and when I make a left or right hand turn. I took it to a shop and they told me I needed new diff fluid, had it done and still chatters though not quite as bad. I talked to a ford mech yesterday he asked me what type of fluid they used I didnt know at the time so could not tell him. I checked the work order from them and they used 75W90 Synthetic GR / 3L . No mention of friction modifier on the work order.
Have these guys put the wrong fluid in my diff.
Anyones thoughts appreciated, thanks
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Have these guys put the wrong fluid in my diff.
Anyones thoughts appreciated, thanks
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Joined: Oct 2005
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From: Louisville, Kentucky
It is best to check your owners manual for the type of differential fluid to use in your truck. My 2002 owners manual for the 7700 model says: For 10.25 inch Traction-Lok axles, use 3.1L (6.5 pints) of Motorcraft SAE 75W-140 Synthetic Rear Axle Lubricant and 236 ml (8 oz.) of Additive Friction Modifier C8AZ-19B546-A or equivalent meeting Ford Specification EST-M2C118-A. 
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Originally Posted by chaser1602
Get the fric mod from ford and put it in.It allows the clutches to slip when you turn.It might take a few miles to mix together but should take care of if there are no internall problems
