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Q: Why would there be a substantial oil leak from top rear of the engine? on 1996 Chevrolet 3500 Pickup

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Oil is running down behind the oil filter area and oil pressure guage needle barely moves at all.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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CHECK OIL LEVEL! ... Have the oil pressure switch checked for leak and test actual oil pressure... Oil pressure switch located near base of distributor - on gasoline engine... Switch leakage is common.

Thanks. It's a 7.4 litre with so much in the way. I've tried to get an inspection mirror in there to look at the darn thing while running, no luck. There is no water in the oil. Should I just go ahead and remove whatever I need, to get to it?
This video I found should be very helpful:

Simply copy and paste the link above, watch video.

▪️Note: First MARK everything that is to be removed so 'YOU' know exactly how it needs to go back!!!
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