My Dad converted his HitchHiker to Disk's and oil bath. He ran AMZ/OIL SevereGear 75-90 with ZERO issues. It only takes a few ounces per wheel as you only fill to the bottom of the fill plug hole on level ground. I would not be surprised if one quart will do all 4 wheels, heck if its takes 2 quarts that is not much, list price is $18.50 per quart.
He never had a leak one.
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2015 RAM LongHorn Dually Air ride Aisin 4:10's
2016 MS 39TKSB3 "Highly Elited"
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