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Fluid change day. What kind of rear end gear oil and posi fluid?

Discussion in 'Ram Trucks' started by shep28, Nov 10, 2012.

  1. shep28

    shep28 Member
    Messages: 84

    It was nice to see that there were no metal shavings on my magnet and the gears look like new. I have seen conflicting info. on the type of gear oil that I should purchase.
    75w90 or 75w140 rear or 80w90

    How much of the posi additive do I add? I have 4.10 rear. Limited Slip
  2. jhenderson9196

    jhenderson9196 Senior Member
    Messages: 615

    What year truck? 03 and newer:75-90 synthetic, no friction modifier needed. 02 and older: any good gear oil plus friction modifier. A Dana rear will run almost anything.
  3. Chiputz

    Chiputz Senior Member
    Messages: 165

    get 2 qts of gear lube and put the whole small bottle of friction modifier in. You'll end up a little gear lube unused because of the posi additive.
  4. jhenderson9196

    jhenderson9196 Senior Member
    Messages: 615

    2003 and up trucks use AAM axles. They have gear type posi units and DO NOT use any additives.
  5. tastebeer

    tastebeer Member
    Messages: 82

    jhenderson is on the mark, I do think the axles are supplied by American Axle from 03 and newer. Dodge may have gone back to Dana in more recent years.
  6. jhenderson9196

    jhenderson9196 Senior Member
    Messages: 615

    No, they have not
  7. NBI Lawn

    NBI Lawn PlowSite.com Addict
    Messages: 1,797

    Jhenserson is correct, no modifier needed on the 3/4-1tons. I put AMA il in my truck and the rearend chattered really bad. I though the rear end was goin out. Ran it like that for about 10,000miles and the witches to mobile 1. Problem went away instantly.