My expy pulls back

[masterhacker]

Mine does the same thing, but only when Im doing 100 (yes i know that's the speed limiter)

 

[jacks3am]

you need to get your truck tuned, mine runs like 1600 rpm's at 55, maybe a regear will be in order, or you might not even be going the speed you think you are because your speedo is off

 

[workman8505]

mine does something similar but its when i am getting off the interstate from 70 or 80 when i coasting down if i pop the throttle at around 50 or so it will act almost like it has a jake brake (diesel) but you can tell its in the trany it down shifts real hard almost like i ****** it down into 2nd. mine is bare bone stock expt for a supper 44 two chamber flowmaster. i just try not to do it but my flowmaster sounds really good when it does it. lol damn i need a one chamber. any one want to trade a one chamber to a two chamber lol