when they swapped the motor did they swap the tranny also? pre 05 arent supposed to have 6spd 100% sure they werent unless it was some crazy option but im almost positive it wasnt. sorry you are right my buddy had injector prolem and his was an 04. but it was the early 04. still the LB7 motor which is the motor with faulty injecters. the 04.5-06 were the lly sorry for the confusion.
neg. my dad has a 3500HD quad cab dually with every option and his has a 5 spd. which is why i dont even think it was an option.