I spoke too soon.  I have replaced the shift stopper arm and have had a good look at the shift stopper cam or plate if you will, they both look good.  I added the shim washer and the clearance and play are back to where it should be.  The pins look to be in good shape and are all accounted for.  I have an extra set just in case.  My problem is still with shifting from 2nd into 3rd and from 4th into 3rd.  With the case still off I can watch the accuation but it gets really stuck and I can't even seem to spin it by hand.  If I shift up and down a few times eventually I can get it to shift correctly but I'm not sure where else to look.  The gearshift linkage doesn't appear to have any wear and seems to accuate all the other gears but this one.  Any idea what to look for.  Like I said I replaced the whole shift arm so I know that isn't it.