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Re: 4-wheel drive
Exactly, I was hoping someone would explain that it was the u-joint bind causing the feeling even with the T-case disengaged.
And the lurching/binding when in 4wd on a good surface is because of the obvious fact that the rear axle is traveling in a MUCH tigher arc than the front axle leaving it with much less actual distance covered or less revolutions for the same distance traveled. And with the front and rear axles mechanically linked through the driveshafts with no center differential like you see in AWD cars, the "slack" goes into wheel slip that is very noticable on these heavy trucks with relatively narrow tires because the static friction is so high that they woln't just break loose a little and be smooth with it, but the force builds up and then a tire breaks loose and you get a jerk, then the cycle is repeated again and again as long as you continue to turn sharp and the surface is uniform and has good traction.
The front diff is definately open. I don't even know if anyone offers a L/S unit for a Dana 50.
Either way, it's pretty stressfull on the drivetrain, so I would avoid it when possible. Or at least pull through it as slowly as you can so you don't shock load one of those front u-joints and pop it.
Charlie
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