I had my drive unit off to replace the engine, put it back on and now it won't shift, got stuck in forward and won't go in reverse. Any thoughts on how to fix the issue?

Sounds like cable end didnt get locked in the jaws . Your going to have to pull drive off far enough to reach in and pull linkage out of forward with large needlenose pliers or tool of choice. Turning propshaft while pulling linkage will make it shift a little easier. Make sure cable locks in when installing . If your new at it , after you get cable locked in , have someone in boat ease shifter into gear while your sliding drive on to keep a little tension on cable until it gets into cavity. Good Luck!!!

Pull the drive again the shift cable didn't go into the linkage correctly.

Thank you will give it shot in the am