Ok,
Can't believe that I couldn't get the filler bolt or the drain bolt out of my 1990 1 Ton Axle. (24mm socket)
I have been spraying with PB Penetrating Spray all day, hit bolt heads with a hammer, and tried cheater bars with no success.
Here is a cheap electric impact gun that I got from Autozone that worked like a charm.
3 seconds on each bolt , done deal.
I'm planning to flush and fill with Red Line 75W90 High Performance Synthetic
two thumbs up on impact tool