For the Frontier, I presume?
Get a stick shift. Diesels are tough on automatics, particular automatics with lock-up torque converters.
Check your RPM range. Your final drive may be too numerically high for a diesel.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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