FORD Gear Differential Additive!?
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Joined: Jan 2003
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FORD Gear Differential Additive!?
Wondering if anybody knows what the heck the purpose of that additive is for that you add to your differential. I know it keeps the clutches lubed so they slide smoother but what if I don't put this additive in will it make my posi loud? or just make the clutches grab better? Any info is greatly appreciated as I am going to put 4.88 in my truck in a couple days, and want to have limited slip but still want both tires to grab well in loose terrain.
THanks
THanks
Senior User
Joined: Nov 2003
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From: Alberta, Canada
I recently used Quaker State fully synth 75-140W and their tech support told me it already has friction mod in it(although there is no mention on the bottle). So no need to add any.
I found this out AFTER i had put in 1/2 a bottle of ford friction modifyer, but no problems so far.
I found this out AFTER i had put in 1/2 a bottle of ford friction modifyer, but no problems so far.
Tuned
Joined: Dec 2003
Posts: 488
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From: Indianapolis
At 5K I replaced the fluid in my rear axle with Mobil 1 synthetic 75w-140. I did not add any friction modifyer. I ran my Ranger like this for 9 years 140K with no problems. In fact, I had good posi. Philip.
Posting Guru
Joined: Nov 2002
Posts: 2,440
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From: Ventura County, CA
Ianlavin is correct. Some gear oils already have the friction additive in them. Others don't, so you'd have to buy the friction additive separately and put it in with the new gear oil when you swap gears to the 4.88's. And always use the recommended weight gear oil (Ex: 75w-140). I used Royal Purple and everything's fine on mine (76K miles).
Daryl
Daryl
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