when i push the tow/haul button i notice on my truck it doesn't even feel like it down shifts. the rpm's don't even go up. on the 06 i had i know when i pushed the tow/haul switch it would lug down and the rpm's would increase. is this because the 07 6.7 has the 6-speed tranny or what? when i push the tow/haul switch with the exhaust brake switch depressed and go to slow down it down shifts automatically, kinda hard. is this normal? just trying to figure out all the new stuff..lol. i guess i could read the dummy manual huh? thanks alot for any info on this.