You will only need to replace bell housing bolts if you lose one. Converter to flex plate can also be reused and can be replaced later without pulling the trans if you choose to.
Now, you recently changed your trans fluid, and the trans had issues with your son driving the car hard in the mountains. The question is why did the trans blow the seal. Possibly just failed. Overheated and filled too high? How many miles did the trans have before changing the fluid? Any signs of slippage when it was driven hard?
When you pull the trans note wether the seal has failed or is pushed out. Dump the torque converter and inspect the fluid. Is it thick with clutch material? Burnt smelling? Changing fluid in a high mileage trans can sometimes cause failure by removing the clutch disk material that was circulating and the clutches start slipping.
Just trying to give some ideas to check out.
Good Luck
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