Chevrolet Repair: 97 6.5 chevy pick up 3500 standard, oil pressure switch, rear main oil seal

Question
My husband has replaced the rear seal and oil pan gasket on the truck and it is still leaking.  Any ideas as to what else it might be?

Answer
HI SHANNON, I WILL ASSUME HE REPLACED THE REAR MAIN OIL SEAL..THIS IS HARD TO ANSWER BECAUSE I CANT SEE WHERE IT IS LEAKING,BUT I WILL GUESS THAT IT IS FROM THE REAR OF ENGINE AREA..HAVE YOU CLEANED THE OIL OFF OF THIS AND CHECKED FOR THE LEAK WHEN IT WAS RUNNING ??? IF YOU ARE SURE THE LEAK IS FROM THE REAR OF ENGINE THERE A FEW PLACES IT COULD BE FROM..BACKSIDE OF THE INTAKE MANIFOLD,[OIL PRESSURE SWITCH,REAR OF ENGINE]]THIS COULD LEAK FROM THE TOP SIDE DOWN MAKING IT LOOK LIKE THE OIL PAN OR REAR MAIN SEAL ARE BAD.. LAST IS THE CAM PLUGS BEHIND THE ENGINE BETWEEN THE TRANSMISSION HOUSING AND ENGINE. CAN NOT SEE THIS TILL YOU REMOVE THE TRANSMISSION. USUALLY IF THIS IS WHERE THE LEAK IS FROM THE FRONT SIDE OF THE FLYWHEEL IS WET WITH OIL..I HOPE THIS HELPS YOU AND IF YOU NEED MORE INFO GET BACK TO ME, AND GOOD LUCK,,,TOM