Dump the ol pump!

Remove the oil pan:

Disconnect battery ground cable.
Remove dipstick, then the drive belt splash shield.
Raise and support vehicle.
Remove front axle shield and transfer case shield.
Disconnect brake line clips from crossmember and remove second crossmember.
Remove converter hanger attaching bolts and exhaust pipe clamp from converter.
Disconnect front propeller shaft from drive pinion.
Remove flywheel cover.
Remove starter attaching bolts and position starter aside.
Disconnect steering shock absorber from frame bracket.
Remove steering gear attaching bolts.
Mark position of idler arm and remove idler arm attaching bolts.
Remove differential housing mounting bolts from the bracket on the right side and the frame on the left side.
Pull steering gear and linkage forward, then move differential housing forward.
Remove engine mount through bolts, then raise engine and block in position.
Drain oil, then remove oil pan attaching bolts, nuts and reinforcements.
Remove oil pan. Clean pan and block sealing surfaces.
Apply sealer No. 1052080 or equivalent to front cover-to-block joint and rear crankshaft oil seal retainer-to-block joint, extend sealer one inch in both directions on all four corners.
Install gasket and oil pan. Torque bolts and nuts to specification.
Reverse steps 1 to 17 to complete installation.

REMOVAL

Remove oil pan as described under OIL PAN.
Remove oil pump-to-main bearing cap attaching bolt.
Remove oil pump.