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http://www.discountautomirrors.com

I have no personal experience with either... Just going off what I've read and had recommended to me. Take it with a grain of salt.

duramaxtuner doesn't have the greatest reviews on duramax forums. I'd suggest http://dansdieselperformance.com

Older thread, but: Change your oil out for some Rotella T6 5w40 synthetic… helps with mileage improvement and has a longer run life in the truck

the 2wd will make a big difference.

EFI live will be happening for me sometime next year

I want his truck

Dex VI can have trouble in the Allison because it's viscosity degrades too much over time. For the original poster's vehicle, Dex 3 or Transynd are the two best options for the transmission.

At...

There's strong mixed reviews on running synthetic in the Allison trans... Everyone says best bet is to just stick with the dex 3

I have a bully dog gt, purchased from axis racing (flicktitty and Lizmo) and it's great. I've heard bad things from duramaxtuner on the national dmax boards. The thing I like about the bully dog is...

A tuner really helped my truck. Also, with this colder weather, you may want to get a grill cover, aka "winter front". I pick mine up tomorrow.

Synthetic fluids in the axles and t case could help...