Cost diff between a very well built 4L80-E and a TCI 6-X is significant. Also, you might find that you do not need as close a step between gear ratios as the 6-X provides with a long-stroke, big displacement motor that will have a very broad torque curve. Local guy has a 4L80-E behind an LS motor twistin a 3.73 rear end. Car is a monster anywhere on the tach and is reasonably calm on the freeway with a full lock-up in 4th (.75 O.D. gear). He actually thinks a 3.42 ring gear would be God's plenty gear reduction. If I were building an auto equipped car with a 462, I'd probably go with the 4L80-E and 3.42's with a nice snappy converter, knowing that I would enjoy full lock-up in 4th.
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