Im trying to change the gasket on my Chevy S10 4.3L Engine, but I cant clear the oil pan. Ive removed the motor mounts, jacked up the engine, took off the flywheel cover and still cannot get enough clearance. Im pretty sure the oil pump is whats blocking me, but before I go do something stupid I would like a few Suggestions.

 

Unfortunately the "easy" way to change the oil pan or gasket is removing the engine from the truck.

 

You have to remove the engine, no other way. Here is the instructions from factory manual. Step 2 is to remove engine.

Remove or Disconnect

Drain the oil.
Engine from the vehicle.
Oil pan bolts, nuts, and reinforcements.
Oil pan.
Gasket.
Clean

Sealing surfaces on the oil pan and engine block.
Inspect

Oil pan gasket. Replace if necessary.
Install or Connect

Apply sealant (GM part number 1052080 or equivalent) to the front cover to block joint and to the crankshaft rear seal retainer to block joint. Apply the sealant for about 25 mm (1 inch) In both directions from each of the four corners.
Oil pan gasket to the oil pan.
Oil pan to the engine.
Oil pan bolts, nuts, and reinforcements.

Tighten

Oil pan bolts to 11 N.m (100 in. lbs.) .
Oil pan nuts at corners to 23 N.m (17 ft. lbs.) .
Engine to the vehicle.
Proper quantity and grade of engine oil.