Will the predator work for tire sizing and diagnostics with out down loading performance programs into computer?

i am pretty sure that is a yes.

yes

Now 1 more question would you be able to use those features on a lly I know they make a unit for each engine,just curious if diagnostics will work on both trucks?

Read this: http://www.dieselplace.com/forum/showthread.php?t=29725

THANKS I THOUGHT REMEMBER SEEING A thread like that