Here is Dodge procedures
click link below
REMOVE OIL PAN
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this is a 3500 15 passenger van.
make sure the crankshaft is not causing the interference, as you may have to turn the crank to gain a little moreAlso the Oil Pump strainer may have to come loose
Loosen Trans mount & be sure there is nothing in the way up top when jacking up motor
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Remove the oil pan. Remove the oil pump from rear main bearing cap.
Install oil pump.
During installation slowly rotate pump body to ensure driveshaft-to-pump rotor shaft engagement. (Unless you have removed Distributor, then you would align the Distributor with Oil Pump Shaft when installing Distriubutor)Hold the oil pump base flush against mating surface on No.4 main bearing cap. Finger tighten pump attaching bolts. Tighten attaching bolts to 41 Nm (30 ft. lbs.) torque. Install the oil pan.