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Discussion Starter · #1 ·
Hello, I have a 2005 lly duramax. I recently did head gaskets and studs on it. In the process I put new injectors hard fuel lines , return lines, intake,up pipe, y bridge. Air dog 150 and cp3 pump

now currently I am having a problem where when I accelerate hard in lower gears it pops and there is a little cloud of white smoke. But if I accelerate 2500-2800 ish or below it shifts fine without popping. My only thoughts is the stock trans can’t shift fast enough or the truck needs to be tuned.
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