T56 to TH350????
Most guys who do this are putting down some real power. It's a logical alternative to the OD units. However, if you wanted to preserve OD you would need to move into a 4L80E.
Lot's of our custoemrs do that as well... problem is it carries a hefty pricetag compared to the 3 speeds.
If you'd like to discuss it in detail give me a call, I don't mind kicking it around with you.
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