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Differential Gear Oil Weight

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    #16
    Originally posted by Brown_Muscle View Post
    Thread resurrection

    You guys using the 75w-140 synthetic, did you add friction modifier if you have limited slip? I know most say it comes with it but i've been reading conflicting things... I'm going to change mine and have a bottle of ford friction modifier on the shelf... would it decrease the clutches effectiveness if i add it to fluid that already says it has it in it?
    I was told that you don't need to add the friction modifier to synthetic Phil. Used Redline in both of my Marauders when I upgraded to 31 spline refurbed trac locs & the clutches were really noisy . Added friction modifier to both clutch noise eventually went away & saw no loss of clutch effectiveness.

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      #17
      I don't think there is friction modified in the Towncar and it chatters a bit when making tight turns in parking lots. Won't hurt anything to put it in there.
      86 Lincoln Town Car (Galactica).
      5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

      91 Lincoln Mark VII LSC grandpa spec white and cranberry

      1984 Lincoln Continental TurboDiesel - rolls coal

      Originally posted by phayzer5
      I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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        #18
        Mine chattered without friction modifier for 45K miles. Serviced and the shop used friction modifier and now it's quiet but just chirps the tires around corners if I big toe the gas. Most likely that's due to the 8-clutch setup in mine.

        Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
        rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
        Originally posted by gadget73
        ... and it should all work like magic and unicorns and stuff.
        Originally posted by dmccaig
        Overhead, some poor bastards are flying in airplanes.

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          #19
          Originally posted by Kodachrome Wolf View Post
          I'm planning on changing the rear diff fluid in the wagon again just to ensure it's staying clean back there after it got new bearings installed.

          I know the typical oil weight is 80W-90. However, I know some later (like '07+) police package Crown Victorias were listed to use 75W-140. I'm currently using the 75W-140 in my '97 over the regular 80W-90. Haven't had any problems thus far in that car.

          However, I'm wondering if the 75W-140 would be okay in an older axle. I'm just trying to extend the service life of components where possible.
          I'd stick with the 80W-90 if it were mine. Why go to the thicker goo if you don't have to? Are you towing with the wag?
          sigpic
          United Socialist States of America
          (occupation government)

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