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There is a procedure called "drive shaft hinging inspection" that shows how to measure play. Its in the 20-3 manual and the tolerances appear very tight. The mechs said the driveshaft/driveline being out of tolerance can cause damage up and down the driveline.

Have the driveshaft balance checked. Or the yoke could be slightly bent. The mech said anything slightly off can cause all kinds of issues.

Ok went thru the manuals again with one of the mechs. Axle vents appear to go into the ctis quick release system. If you have a clogged release valve maybe ctis air is making its way into the axle. A way to test this is to take out the top plug on the diff and air up the ctis then dump air and...

Maybe there are check valves along the lines. Disconnect your axle breather lines and install some temporary ones run up high. Is your ctis disconnected? I will ask one of the mechs I know about it.

It looks like the vents go into the air brake system or the ctis and to the quick release valves.

Do you know if air can be blown thru the rear axle vent? The manuals are not big on diagrams they are more flow chart troubleshooting. Personally I like diagrams I can lay out and devise my own troubleshooting. On the older trucks there are vents on the axles. When those vents are blocked up you...

I haven't gotten into taking a truck that far apart. Engine and all the little cab parts are what resells quick. Why don't you disconnect it coming off the axle and blow some air into it.

It will spin a bit but should not be running. It's loud when running you can't mistake it. The assembly spinning with the fan off will cause the fan to spin a bit.

Going into water you should have the plug in and fan off. The plug should not be left in after leaving the water though. Fan switched off it will not spin. The fan only comes on with a temp sender its not always on.

As soon as the water is higher than the air intake stack then they are done. There was a 1083a1 sold off in PA last year that had been fully submerged. Maybe one of the trucks in the vid.

The dash switch will keep the fan from coming on. Designed for use in water where the water flow is expected to provide the cooling. There are vids online of LMTVs driving thru water until the intake went under and they stalled out. The electrical is very prone to corrosion so going under water...