Mines pretty close to 900. Have you broke one at this level? If so what part? By building my own I have paid attention to clearances, wear, and failures. Then adjust as necessary. It gets an easy 100 passes a year, not just the occasional blast. Going on year 6. Every automatic car I've raced since the 80's has had a 727. Only hard part failures I've ever had are a stripped front planet, worn aluminum clutch carrier, reaction shaft worn.
Doug