350C Dozer engine

Hello. I posted earlier as to how to remove injectors. The engine on my 350C is stuck tight and I wanted to pull injectors to try spin it.
The full story: I was working on pushing dirt to back fill around my new house, very light duty. Everything was running fine. I stop for lunch and it would not turn over. Hit the start button it it just buzzed like it had a weak battery. When I shut if of it did not make any noise, there is no coolant in engine oil,it did not overheat or throw white or black smoke.
I tried to boast it, eventually thought the starter was shot so I pulled the starter and when I put pry bar on fly wheel it would not budge. So I pulled hyd pump thinking it may be the problem. Put 36 inch pipe wrench on output shaft and it would not budge a hair in either direction. It was rock solid tight. I left it alone and used another tractor I have, and to finish building garage so I could have concrete to work on, and a year went by. I checked it again and it was tight so I tried to pull injectors, I loosened the hold down claps and but did not pull them because they would not come loose and i did not want to take a chance wrecking them with a slide hammer. Don't want to buy a set for nothing.

So I pulled the engine and as it is hanging on engine hoist I am able easily spin the flywheel!!

I pulled the dozer across the yard to shed and both tracks turned, in fact it will roll on it own on very slight slope. I pulled it with a small RTV.
If the reveres-er or transmission packed up I still should have been able to rock the engine because if the springs in the reverse-er clutch. Both the reverse-er and trans oil level is up.
Any ideas as to how to proceed, I don't want to tear down engine for nothing and I don't want to reinstall the engine only to have problem reappear.
How can I check the reveres-er and transmission to see they turn freely? Does anyone think they are the problem. The flywheel is not missing any teeth.
I am a loss on what to do next.
Thanks to all who respond.
 

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