My car has the newer piston tyope, yours should too. The piston type is more reliable and does not need to be rebuilt as much as the diaphram type. But there is a rebuild kit for the piston type if a repair is required.

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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