[Vernski]

Looks like your on the right track Pepsi the plug at the lower level is the drain. When empty replace the drain plug leave the top plug out then fill with gear oil till it runs out then replace the plug. Most all trucks and pickups are the same in the way of checking the level of rear,trans or trans-case. In finding what is making the noise take off the drive shaft. Run the engine with the transmission in gear and that being a 4 wheel take the front shaft off also. that should tell you where the noise is coming from. It is possible it could be a U joint but I don't think so. The process of elimination as simple as it gets. Hey that Red Line gear oil is good stuff the fleet I drove for used it in all there trucks. Good luck on the problem..Vernski

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