VERY SNAPPY CM870

[3406E]

Just started to test truck out and as you touch the throttle pedal it turns into a bounce about. I gotta start off in 3rd really slow and baby it to get somewhat of a decent take off. But the problem is really. Can it be adjusted, who where to get it done? I have insite but don’t have the calibrations yet. NEED YOUR HELP PLEASE. THANKS

Canadian 9900 eagle
13speed 18913A
Super 40 rears
3.73 gears