well finally looks like the jac brake can be used on the auto's - the sad part is it's on the 2006 auto's with the 2005 maybe later with a ECM upload...

the 2004.5 can't take it - at least thats their story! not enough memory in the ECM . plus the thurst washer issue - which I heard somewhere that it was fixed back then - just can't use the fix.. any vechicle hackers that put in more memory on these ECM's .