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I’m about to do a Transmission service and change the fluids in the t-case and front and rear diffs. Any recommendation on fluid makes and weight. I was thinking of <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-comffice:smarttags" /><st1:PersonName w:st="on">us</st1:PersonName>ing royal purple 75-90w in the diffs. The truck is a 5.4 with tow package and the 3.73 LS rear –end. I'm in the boston area so it gets pretty cold here in the winters, if that makes any difference.