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More information needed.
Did it jam after driving? Or, was it this way as soon as you tried to move it?
If it jammed after driving, yes, suspect the pinion bearings might be too tight.
If it jammed before even being able to move it, I'd wonder if, somewhere in the process you had the shift tower off and, when it was reinstalled one of the gears moved out of the way of engaging the shift fork and jammed the transmission.