I have a 2005 crew cab silverado 5.3 auto with 3.23 gears. only mod is slp intake. after removing all tm and disabling abuse mode, truck still bogs on take off and a little between each shift. shift points have been raised to 5900 rpms, also. i've read reviews of where guys just removed tm and their trucks became burnout beauties and i can't even so much much as squal.