hell I did my own overhaul on my 87 about 4 years ago when I burnt it at MAR, so far 4 years almost 50.000 miles pulling a trailer with up to 8,000 lbs total load for some 12,000 miles of those 50 and not a single slip,(knok on wood) I have used sinthetyc ATF since the overhaul, probably 1,500 of those are off road miles, filter and oil changes every 12k or once a year which ever occurs first.
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