One more thing: Disconnect the dipstick tube from the air intake manifold. I just ran into this while trying to take my auto trans out for a 4spd manual swap.

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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
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'82 300D Turbodiesel - sold