Heading over to Level 10 Transmissions, we looked for some more e.t. by installing one of its high-performance torque converters into our Killer Whale. But when Mike Bonassisa removed our 4L60E, we noticed a lot of play on the input shaft and some wear on the stator support shaft. Level 10's proprietor, Pat Barrett, suspected there was more damage inside and recommended a complete internal upgrade. We took his advice, and once everything was apart, his hunch proved to be right.