hi all,

would it be very helpful if i did:

Royal purple 75w90 gear oil for differential
Royal purple max ATF for auto tranny

?

anyone feedback would be GREAT

thanks!

 

Your automatic needs a Mercon-V ATF. Does max ATF meet/exceed Mercon-V? If so, go ahead and use it.

I would recommend a 75W-140 w/ friction modifier for the rear differential.

 

I run Royal Purple all the way Around! I also believe www.brenspeed.com recommends it!....I'm sure many are just as good but probable none any better!

 

hi metroplex,

thanks always for your information.

i was thinking of just adding amsoil or ford racing friction modifier...but then then i ready royal purple gear oil has friction modifier already added to it.

which option is better? stock gear oil with added friction modifier or royal option?

 

Ford/Motorcraft gear oil is overpriced. I would add 4 oz of Ford friction modifier with whatever gear oil you use. I never trust the formulations.

 

thanks metro.

exactly which model # ford racing friction modifier should i get? there are 2 or 3 of them.

thanks!

 

Motorcraft XL-3, available almost anywhere. There's only 1 part #.

http://www.fcsdchemicalsandlubricant...nsaxle%20Fluid

 

Not a fan of RP.

My choice is Redline.

Richard