The current estimate for the age of the universe is 13.75 billion years. That's 165 billion months. That's 16.5 trillion dollars, at 100 dollars a month. Current US debt is about 16 trillion dollars. So they're a lot closer than you might think!
Thanks. I did PM him the math (so as not to detract from this thread) and an explanation of why I designed the question as I did. I wanted to make people think.
Back to this topic, my message was brief, that I thought the insult was from the inside of the case to the outside, but I didn't reiterate the OP's very important comment in the first message...he was only able to propel the tractor using the front wheels. That suggests something broke away internally and was driven into the case in my view. The fact that the front wheels still drive does eliminate many parts from suspicion...we know the drive line is good at least to the point of where the power gets taken off for the front, as the speeds must be synchronized. I think the problem has something do do with rear differential. I think Aaron makes a good point/suggestion.
The OP may not be in the mood to spend money on extraneous things given the potential financial loss of the breakdown, but that hole looks like it may be large enough to get some inspection cameras through. For example, my Whisler stalked inspection camera will go through a 10mm hole. These cameras were not rated highly in some reviews, but they are less than $200 at our local Costco, so I bought one even though I already have a SeeSnake Micro.
I'd jack it up, and check for proper differential action...when you turn one wheel, the other should go backwards in most cases. See if the wheels are still linked together through proper differential action, and rotate it all about checking for odd things. It the differential is intact, you can confine the damage to the area between the front power takeoff and the power distribution to the differential.
I don't think I said I was sorry for your recent trouble, but I am of course...I hope you can reach some sort of relatively painless resolution. A
BX22 may be nearly identical to my
BX2200 and if I can look in my service manual and answer a question, I'd be happy to try. Many people here know these tractors VERY well.