What would possibly cause the truck to shift hard between 1st and 2nd and 2nd to 3rd? I have reset the memory of the transmission with my Scanner and it will shift fine for a while and then start hitting second and third hard again(2nd harder than 3rd), unless I lift off the accelerator as if I we're driving a manual. Trans serviced religiously every 30k miles and never towed much weight or plowed much at all. Also seems to lack power under a heavier acceleration, but not consistently. I'd say it feels as if the drive train is tight like calipers hanging up but that's not the actual case. On this topic I've swapped the throttle body with my other 2500 thinking it was a TPS issue but no change(cleaned TB during this swap) and lastly checked the intake for leaks via carb and choke spray as well as propane. Any advice/input would be helpful.
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