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Need help with rebuilt transmission on 14 silverado


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Hi, I bought a 14 silverado december 25 of 2019. It came with a 3 year transmission warranty. I feel it has a problem. From 1-2 it shifts funny like it is slipping but not really.  I decided to get a diablo tuner i3. I did the 93 diablo tune and 1-2 got worse. It almost gives you whiplash. I have had it updated 2 times already but when I remove the tune it goes away but it comes back after a while. Can I get some advice. I took it in to get looked at but they cant recreate the problem. All other shifts are great and the truck has a lot of power.

Edited by Conivan
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