Loving the car with the automatic. Still a joy to drive and my wife now can drive it also (Happy Wife). Switched back to the 3.07 diff and took it for a test drive. Totally different drive. Wished I'd done it sooner but no regrets, the 3.64 was fun in its way. Currently in the process of changing the oil pan gasket, power steering hoses and reservoir kit, radiator expansion tank, accessory belt tensioner and pulleys. Almost done then seriously looking for a new owner.