Hi,
When you say it locks up, is there something that causes it to happen? For example, when you apply the brakes? Is it always locked up? Is the 4wd disengaged?
If it happens when you press the brakes and then it won't turn when you release, try this. On the rear of the brake caliper is a bleeder. Open the bleeder and see if the wheel then turns. I attached a pic below showing what I am referring to. Let me know what happens.
If that is not the case, let me know that as well and if this happened all at once, if you noticed a change over time, and what all has been checked to date.
Take care,
Joe
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Tuesday, September 8th, 2020 AT 6:23 PM