i dont know how you would adjust the shifter, maybe the bushing on the shift arm has gone bad.
also, have you tried double clutching to get it into 4x? I used to have to do that sometimes with my old Rockwell tcase. or, move the truck forward about a foot to take the tension off the gears.
hth
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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