I think I have a seized bearing right before the pinion gear on my Oliver 550. 
When I tighten up the bearing cap everything is locked up even with everything in neutral. When the bearing cap is off everything spins as I think it should. Questions: 

Do I have to split the tractor to replace the bearing? 
WHo might have this bearing in stock? 
Approximate cost? 

Here is a link to the pics. 

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Thanks 
Clint