While driving my car, between 45 and 50 mph my trans seems to be making a jump motion, or a sort of skip as best as i can describe it. My mehcanic told me I may need to update my Trans?? He could not do it and said I would have to take it to a dealer. I contacted the dealer and they refered to it as reprograming or flash updating the trans, but not looking at my car could not say if that could be my problem. Ive never heard of this, and could not find any threads on the subject. I took it to the dealer today and he stated that i have all the updated info already and fortunetly did not charge me.. Says he thinks it may be internal..What is my next step??

 

Could honestly be your catalytic converter being clogged.

 

It may be internal.. How many miles on trans? could be torque converter problem ?