can you use the 1745 tuner on more than one truck, also does it work for the 5.4 and the 4.6

 

Only one truck at a time... in short, when you up the program, you're loading the stock program to your tuner. You'd have to reload your stock program back to the truck to return the 1745.

As for 4.6 to 5.4 -- no clue.

RP