Graham - sorry to hear about the failure. This is a problem that has been discussed extensively on a number of Jeep forums, however the problem is not one discussed by dealers or in other media. Therefore many 05/06 Jeep owners never hear about it. The problem is "solvable", and a repeat failure is avoidable with some simple modifications to the Oil Pump Drive Assembly (OPDA). I did the modification to mine in less than an hour. My OPDA was howling just after startup at around 70k miles. I now have over 110k miles on the same engine and OPDA, and will get many more miles from this engine.
Daimler/Chrysler changed sources for a number of components used in the last two years of the TJ/LJ line, and it was not in an effort to improve quality. They cheapened parts and used components from other models simply to streamline and maximize profitability on a soon to be terminated vehicle line. It was shameful. The engine failures occurring in the last 2 years of production of such a venerable engine as the 4.0 inline six are due to accountants, not engineers.
BTW -anyone even THINKING about sourcing a stroker from Titan, PLEASE do your homework. There are far better sources.