Hey Troy,
Assuming that the trans itself isn't at fault, there are two adjustment/trouble points to check.
Before touching the shifter (and those two bolts) lift the carpet in the rear and remove the inspection plate on the top of the tunnel right next to the VIN stamped into the tunnel. Beneath this plate is the shift coupler. It's a cage-like device that connects the shift rod with the trans and it should be NEW LOOKING. If it's old/worn/broken replace it with a German or urethane one. It's responsible for the "feel" of the shifts when driving as well as being the sole connection point.
If thats OK, or once you replace it, if the trouble continues, then you can adjust the shifter. The adjustment is limited to fore and aft and only amount to an inch at best. The shifter will move more than that, but the "sweet spot" where everything works, is very limited.
Loosen the two bolts that hold the shifter to the tunnel, just a tiny bit. just enough so that the entire shifter assembly moves back and forth with some difficulty. If it's too far back, center it and vice versa, tighten the bolts after each minor movement until all the gears engage correctly. This is kind of a do it by feel thing., you'll know when it's right.
That's about it. If the trans is good, you should be all set to go. If the shifter still hangs in the gears and all else checked out, it's the shifter itself.
I have a good stock shifter mechanism that I use almost as a diagnostic tool for this. When all else is correct and the stock works, then the aftermarket needs adjustment/replacement.
Most aftermarket shifters have a single adjustment point and that's for the reverse lock-out. Usually a double nut or insert nut which tensions the spring. If you're getting reverse OK, then leave it alone. If not, you can loosen it a bit to allow a little more side to side movement. Sometimes the shifter will wobble too much, in this case you can tighten up a bit on the spring to lessen it.
Sorry for the length, hope it helps.
Luck,
TC