Rear Differential Fluid - Question
Fleet Mechanic
Joined: Jul 2010
Posts: 1,354
Likes: 31
From: Winnipeg
Friction modifier is used in Ford trac-loc differentials to help the clutch fibers slide against the steel plates. This helps to eliminate clutch chatter when turning corners at low speed. 4oz should be enough to limit the noise if it does chatter/grunt. You don't really want to put too much in as it reduces the friction between plates which reduces the efficiency of trac-loc option in the differential. Just add enough to get rid of the chatter if it's there.
Differential fluid will look dirty from the slight wear of the clutch fibers. It shouldn't hurt the internals of the diff.
Differential fluid will look dirty from the slight wear of the clutch fibers. It shouldn't hurt the internals of the diff.
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5th Wheeling
Joined: Sep 2020
Posts: 39
Likes: 1
Friction modifier is used in Ford trac-loc differentials to help the clutch fibers slide against the steel plates. This helps to eliminate clutch chatter when turning corners at low speed. 4oz should be enough to limit the noise if it does chatter/grunt. You don't really want to put too much in as it reduces the friction between plates which reduces the efficiency of trac-loc option in the differential. Just add enough to get rid of the chatter if it's there.
Differential fluid will look dirty from the slight wear of the clutch fibers. It shouldn't hurt the internals of the diff.
Differential fluid will look dirty from the slight wear of the clutch fibers. It shouldn't hurt the internals of the diff.
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
Truck was parked in the driveway. There's a natural slope.
I topped up the rear differential with almost 1 quart of Royal Purple !
There's only a few squirts left in the bottle.
Wow !
I had this changed a couple yrs back at a shop. I dropped the vehicle off so I wasn't present to see how much was actually put in.
There's no leaks whatsoever. Is it normal for the fluid to be consumed or evaporate as time passes ?
I'll have to check the front diff now. I'm worried !
I topped up the rear differential with almost 1 quart of Royal Purple !
There's only a few squirts left in the bottle.
Wow !
I had this changed a couple yrs back at a shop. I dropped the vehicle off so I wasn't present to see how much was actually put in.
There's no leaks whatsoever. Is it normal for the fluid to be consumed or evaporate as time passes ?
I'll have to check the front diff now. I'm worried !
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5th Wheeling
Joined: Sep 2020
Posts: 39
Likes: 1
I think maybe it would be a good idea to consult your owner’s manual as most of what you are asking about is in there. Depending on your “natural slope”, you have probably overfilled the diff as the fluid level should be 3/8” below the fill hole when on level ground. Sounds like the shop that changed the rear diff fluid a couple of yrs back might just have put the correct amount of fluid in there.
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guitarpicr
1999 - 2003 7.3L Power Stroke Diesel
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Jun 13, 2007 11:14 PM
