Engine braking behavior change after spring TSB

Ok not sure how many people experienced this but i figure out starting post may bring out people fro mthe woods.
I had my spring TSB done on my 07 which is bone stock. After TSB was done my engine braking function was gone. Truck simply coasted down the hills and that's a lot of truck. However, as my rear springs started to settle (my driver side much more then pass side) engine brakign started to come back although not as hard as it was before change. My only guess is once TSB is done deceleration sensor gets out of balance and no longer detects truck being level (spring TSB results in rear being higher then front)
Now my question would be if anybody had experienced the same thing and if they got deceleration sensor re-calibrated?

 

Second time someone has mentioned this (trans not downshifting after TSB) on this board.