alright guys this thing has been a little work in the making for a friend, but we got long tube headers, no cats, edelbrock supercharger with stock setup for supercharger, a Circle D converter 3,000-3,200. she runs good and shifts solid but sometimes in lockup the converter will shimmy. but the dyno numbers were a little low for what we estimated. any thoughts or advice would be greatly appreciated. 2015 gmc sierra 5.3 edelbrock superrcharger.hpt2015 gmc sierra 5.3 edelbrock superrcharger.hpt