I've heard more stories about mainshafts snapping than the gearbox housing splitting. If the mainshaft breaks and there is very little "shrapnel" to contend with than it's not too bad. But if little pieces float around then it's a major expense. If the housing splits as in your case I'm not sure what can be done. Maybe welding the case and fitting new internals will be okay...but more often they replace the whole trans with the 512TR version which is much stronger. If a TR is abused with burn outs, and hard launches, eventually one of these two problems will occur down the road...pun intended. Thats why people (prior owners....NOT necessarily you) need to learn to drive these cars properly. Use just enough revs (below 1600) and let the clutch out from a dead stop as smooth and quick as possible. In my TR I'm able to almost "idle" away from a dead stop. No speed shifting is possible in a TR, so you must be deliberate and accurate, with the clutch totally disengaged during the transition. Lots of full-throttle acceleration in first gear is to be avoided if possible...or done sparingly. Once in second gear or higher full throttle is fine. I think I've heard that a 512TR gearbox installation runs around $15k or so here in the U.S....and will probably last forever unless you track the car a lot. The price you mentioned in your original posting sounds "reasonable" even though it is a ton of money. It sucks that the dealer is balking at honoring the warranty. I would at least explore some legal action if it becomes necessary. If they knew prior to selling the car that this was a "common Ferrari problem" and didn't disclaim this in writing, then you may have some leverage to get it fixed at a reduced amount. I would at least consult a lawyer about it. If the car broke at a location where it was not being subjected to high speed or abuse but driven in a conservative manner (no skid marks, no burn outs, maybe even a witness of the event) this would help establish a case. Please look into the situation and keep us informed.