After more research i think i would need to buy the stand alone controller. I see a ton of dyno tune guys supposedly wrecking the transmissions. might get a little more out of them but the stand alone like the FAST one seems to be the better choice. I called TCI and they want to sell me the 6X which is a 4L80E with 6 speeds (modified some how) but i cannot find a post or a review on the transmission. A lot of people are bashing them but i want to hear from someone that actually has one.
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