Mine runs from 5.25 to 7.5. Fuel quality seems to have nearly as much influence as speed. I've had everything serviced, no problems noted.
I'm guessing that it is just geared to pull a big heavy stacker, not a jeep.
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2006 Renegade/Freightliner Coronado 43', Detroit, twin screw, 12spd
2001 Ford Excursion PSD
2017 Ford F450
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