diff fluid

  1. Rob McClure

    rear diff fluid question

    hey yall, my 1500 has the 3.21 rear gears ( i know ,lol ) without limited slip , I talked to ram to verify that it didn't have limited slip and they confirmed and the y sent me the build sheet which is pretty cool , my question is , I have Amsoil 75w/140 fluid am I good to run that in the diff ?
  2. Kb1229

    Diff fluid questions!!

    Hey,I got a 2013 ram 1500 5.7 4x4 and today received a delivery of royal purple max gear with friction mod add 75/90 for the front and 75/140 for the rear as per my manual . I've read on other posts guys using 75/85 for the front diff,so my question is Front diff 75/90 Rear diff 75/140 does...
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