I have a 1998 Chevy Z71. When I put it in 4WD, if I attempt to make sharp left or right turns, the truck will lock up and refuse to move. I hear groaning and scratching sounds, but cannot locate the source. If I keep the wheels fairly straight, it drives fine. The only way to fix it is to take it out of 4WD and straighten the wheels.
I was given an opinion that the front spider (pinion/side) gears are broken.
It is possible for the spider gears to be broken adn causing this, but more often it is ba u-joints in the front drive axles(not shaft)are worn out.
In that case wouldn’t it happen all the time, regardless of it being in 2WD or 4WD?
No, because the front drive axles do no spin unless it is in 4 wheel drive. A good experiment for you would to put all 4 corners on jack stands and have someone put it in 4 wheel drive and you can whatch as they turn the wheel.
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