Cat Dead Spot

I have a cat C-15 MXS factory 625hp that has a complete PdI on it. In a 2006 Peterbilt 379. I get a dead spot in the throttle as i shift gears when taking off first thing in the mourning. Almost seems like my drive wheel slipped on a patch of ice, but only for a split second. I don't notice when loaded, or when truck has been running all day. I have replaced the tps on the foot pedal. Anyone have any ideas?

 

I think they drop. It happens so quick, I will have to pay better attention to RPMS.

 

ok, thank you, I will have to check into those sensors.

 

Could either of those engine speed sensors have anything to do with my speedometer bouncing and a growl/shake when i go into a good pull at low rpms?

 

Ok. I have had yoke changed and output shaft checked multiple times. Driveshafts rebuilt and balanced. I just wonder if my " Reman" transmission was done with substandard parts. Next time it will be a new one. It was really growley today, so im guessing it wont be long. Thanks for all your help.

 

I do sometimes wonder if my ride height is off. I go to one shop, and they say it was 1.5" too high. I go a few months later to the next shop, and they say its .75" too low. There seems to be some disconnect in this area. I have the suspension that does not have the big horse shoe shaped springs, mine are just the standard springs and air bags. 2006 Peterbilt 379. What should my ride height really be at?