I'll hand out some friendly advice. The guys on here will bend over BACKWARD to help you, that's how I Found them back in the days of dial-up internet. They have been pulling my grease out of the fire for well over 10 years.
I have no idea how to fix your steering. I THINK Bondo was saying that THIS:
Strahman said:
I did not touch any of the steering. All I did was replace the stern drive and it is rotary steering.
I think they call it TRU-COURSE STEERING. Could the worm wheel in stern drive been put in wrong? Like I said every thing worked good intel I put the stern drive in. Could it be wrong spur gear or wrong worm gear?
is where your problem lies. ie: worm wheel in wrong, wrong spur gear or worm gear.
Remember you'll catch more flies with honey...
If you want a thorough diagnosis, you'll need a thorough explanation of everything you did to the boat/motor/drive. Then give it some time, its nice weather out and many are on the water. I plan on being there this week.
Or drop it off at the nearest Marine Repair Center and find out that BOAT is really an acronym for "Bust Out Another Thousand!"