Gear oil help please!

[POORMPG79]

Wanting to change the front and rear differential gear oil in my 2010 Raptor can anyone tell me what weight oil goes in each as well as quantities and if I also need a friction additive or not as well thank you in advance.

 

[Ricoman]

Changed REAR in my 2014 last year....used AMSOIL SEVERE GEAR® 75W-90 ... its expensive...but so is a Raptor... think it was around $12 per qt. at time...No need for Additive it has it already.....
Hard to say which "Brand" is best,or working best...and you will go crazy reading all the reviews.... so all I can say is I have not blown the rear up yet..so must be working....
I believe you need 5 qts .... should say so in manual.

Edit after reading a few other replies.......my mistake...that was 5 pints....not qts... Also....as I understand the 75W/140W is for extreme condition and if your towing ..... in my case,its just normal highway driving and was told 75W-90 is the way to go,front and back.

 

[Thomas_JohnDoe]

2010
front 80w90 or 75w90 3.6pints
rear 75w140 5.9 pints

 

[Ruger]

The factory owner's manual for my 2011 says:
- Front differential: 80W-90, 3.5 pints
- Rear differential: 75W-140, 5.5 pints
- Transfer case: 1.6 quarts of Ford Transfer Case Fluid, but Ford has abandoned its proprietary fluid and the spec is now for Mercon LV.

 

[POORMPG79]

Do I need any friction modifier with the gear oil in both diffs or just the gear oil only?

 

[Gen1TillDeath]

Friction modifier is ONLY used in the front Diff

 

[Ruger]

Do I need any friction modifier with the gear oil in both diffs or just the gear oil only?

No. Just gear oil only in both differentials. There is a long thread discussing this here in FRF, and the upshot of the discussion was that friction modifier should not be used.

 

[POORMPG79]

Thank you so much

 

[julien194b]

if you take the good oil you need, why do you want add something else, absolutly not necessary, may be worse...

 

[pat247]