It has HIGH PERFORMANCE REBUILD KIT, KEVLAR BANDS, SHIFT KIT, HEAVY DUTY SPRAG, ADJUSTED THE PRESSURE WITH THE ELECT. PRESSURE CONTROL MODULE(EPC), HD SUN SHELL, EXTRA CLUTCHES IN THE 3-4 CLUTCH PAC. As far as mileage, it has between 3,000 and 3,500 miles on it and shifts strong. I have well over $1000 into it not including the converter. It was built to handle around 500 hp according to my trans builder who is a local shop. This needs to go asap...... Looking to get $450 with non lockup 2800 stall converter.