The first, and least expensive, place to check is the shifter linkage adjustment. Put the transmission in neutral; you should be able to slide a pin throught the alignment holes in the lower shifter arms. If the arms don't line up, adjust the rods until they do. If the shifter is already set up properly, how old is the shifter itself? The shifter or its various pivot points, may be worn enough so that it isn't "throwing" the transmission far enough into gear. Try installing a new or newly rebuilt shifter before removing the transmission. After you have eliminated the shifter as a possible source of your problems, then move on to the more involved job of checking the trans.
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