This is the basic way to change the oil pump in a jeep wrangler.
Disconnect negative battery cable.
Raise and support vehicle at side sills.
Drain oil.
disconnect exhaust pipe at exhaust manifold.
Disconnect exhaust hanger at catalytic converter and lower exhaust pipe.
Remove starter.
Remove flywheel access cover.
Position jack and wood block directly under vibration damper.
Remove through bolts from engine mounts.
Raise engine to remove oil pan retaining bolts.
Remove oil pan by sliding it to rear.
For oil pump remove....remove mounting bolts and oil pump.