Wow! I found all the differential front cover bolts to be somewhat loose. No drain but it drained well when I removed the two lower bolts. Nasty black stuff but still flowed.
It took right at 5 gallons to do the transmission and diff.
Local parts store didn't have the engine oil (Wix 51129) filter in stock. I also discovered the air compressor filter missing. I pulled the housing to clean it and it was empty. Assuming a foam filter will suffice.
Thanks again! This forum keeps these old trucks going.
