It looks like accidents take these beasts out of commision more than wear and tear. I'd pull the engine and trans and start searching craigslist for your next rig. I'm seeing lots of these cars being given up because the auto trans has failed.

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold