bad synchronizer rings will cause the gears to grind when trying to engage them, is that what is happening?
A clutch that is not disengaging all the way will also make the transmission difficult or impossible to shift.
If grinding is not an issue, but the lever just can't be shoved home into certain gears, I would suspect it's an adjustment problem, or the trunion bearing.
Your friend on the DTBB, George
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