I've got an issue wit my transmission. if I manuall keep it in 2nd or 3rd it will work fine, if I leave it in "D" it will go through 2nd and 3rd then when 4th is supposed to hit I get what feels like neutral. I've recently done a full rebuild on this motor and I had to replace the transmission wiring harness. I don't know if it had 4th gear before all of this as it wasn't running at that time.