Yes it does have tow/haul and yes it does have grade braking.
The truck is in dire need of some updates, the tranny can be quirky as an SOB.
I am not starting a pissing match, It looks really similar to an Allison IMO.
Bill
I have the 6L90 in the 07.5 GMC. It actually looks strikingly similar to an Allison 1000 series. Its not a bad tranny at all, In fact It feels and shifts just like an Alli.
Its reverse sucks though, its geared like a 4L80, I like the reverse in an Alli better.
I should take a pic of the bottom...
I use this cheap stuff made by Meguiars. Its called NXT Generation TECH WAX. Its a spray on wax thats 8 bucks a bottle, and lasts for like 6 applications to my truck. Its really good stuff and has to last at least a month. The truck looks so shiny when its done like its still wet.
Eagle one...