i have the old badge like you on my 06 but it is an lly. the 06 lly and lbz are the same engine. maybe you have the lly model? what is your 8th digit in your vin. if it is a 2=lly, D=lbz. i thought all lbz's had the newer badge.
Humm, checked the vin and the 8th digit is a 2 ive read the 06 lly is a lesser hp tune then the lbz. The truck has the 6 speed with the manual shift function, and the high idle and all the same stuff the lbz's have (brother has a lbz same with dad and a friend and I work on them all)
My dads, brothers and buddies all have the "allison duramax" badge, 2 are 06 lbz's and one is a 07 lbz, all with the six speed manual option. Thanks anyways guys! Soooo do i now have to change my sig to lly? haha