what differential fluid do you use?
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Freshman User
Joined: Mar 2009
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what differential fluid do you use?
I'm going to be changing the fluid in both axles on my truck and I was wondering what brands you guys use. I'm considering Royal Purple given it's what I use in my bike and makes a very good motor oil. Also my front axle makes noise. Not really a grinding but kinda a tapping. I know a lot of 4x4's make noise like this but I also know a lot of them don't. I'm thinking it just needs the fluid replaced, well I know it needs to be replaced but any other thoughts?
Senior User
Joined: Aug 2009
Posts: 304
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Go with either motorcraft or mobil 1 ( full synthetic ). If you use motorcraft , make sure you
add 8 oz.(10.25 rear end) 4oz. ( 8.8 and 9.75) of friction modifier to the rear. 75/140 Rear. 75/90 Front. Mobil 1 doesn't require the modifier.
add 8 oz.(10.25 rear end) 4oz. ( 8.8 and 9.75) of friction modifier to the rear. 75/140 Rear. 75/90 Front. Mobil 1 doesn't require the modifier.
Elder User
Joined: Jun 2007
Posts: 937
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Red Line 75W-140, nothing better regardless of price.
Get it from the internet (ogracing, amazon, etc.) and it's actually cheaper than you can get Motorcraft or Mobil 1 75W-140 locally.
My next choice would be Amsoil Severe Gear, then Delo/Rotella/Schaeffer's Moly, then Motorcraft/M1/Valvoline SynPower, etc.
Get it from the internet (ogracing, amazon, etc.) and it's actually cheaper than you can get Motorcraft or Mobil 1 75W-140 locally.
My next choice would be Amsoil Severe Gear, then Delo/Rotella/Schaeffer's Moly, then Motorcraft/M1/Valvoline SynPower, etc.
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