tcoilburner wrote:
I am will to guess, since no reason is given on truehi9.com, that no synthetic oil is to be used. That a synthetic oil will not stay on the ring gear long enough to travel to there channels to oil the bearings. The mineral oil sticks to the gears long enough to travel to the oil channels. Without out contacting them this is speculation.
Synthetic oils do better in most situations, but there are some situations where there properties work against them. As in high pinion axles. I hope I get this link right.
http://www.machinerylubrication.com/Rea ... ional-oilsThis one also.
http://www.machinerylubrication.com/Rea ... c-gear-oilI can't use synthetic gear oil in my RockJock60 and Curries reason is the pinion bearings will self destruct in 200 miles or less.100% warranty void if any traces of synthetic gear oil is found.When I asked what gear oil do they recommend and they stated the cheapest 85w-140 dino is the best.
You also can not go off of stationary machinery,they never see the stress of what a vehicle can experience offroad."High flow" is not what you want in a diff when your rear diff is articulating on the trail.You want that gear oil to stay in place.
And again the heat dissipation is a joke for synthetic gear oil.Wish I could find that test they did with 2 identical(and brand new) pickups and put 75w-140 syn in 1 and 85w-140 dino in the other,hooked up 10,000lbs and drove for 100 miles in the desert.Then they pulled the covers off the diffs and measured the ring gear temps.The one w=using dino gear oil was much cooler then the synthetic gear oil ring gear.
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