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Looking for some help with a problem I have. Just purchased my first duramax a few months ago and love it, unfortunately, I'm having some problems with it shifting now after doing a few mods. It's a 2005 LLY w/ intake/exhaust, EFI live, and has 202k. It was running fine but I was told to put a shift kit in to help save my tranny if I ran some of my bigger tunes. A buddy and I put in a bullydog shift kit to help and now sometimes, it shifts real hard from 1st to 2nd. When it shifts, it seems like it kicks out of first, goes into neutral, the RPM's go up, and then it hits 2nd real hard. When it acts up, theres a little hesitation between 3rd and 4th as well. It doesn't do it all the time so I'm wondering if its something electrical. Any help would be greatly appreciated...
 
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