Just picked up my 2008 GMC Sierra SLT Duramax Ext Cab,6'6" bed. I went to order Weathertech floormats I've had success with in other vehicles & they told me they "do not make them for the Sierra with the Allison transmission". I am beating the crap out of the floors, due to rain, mud, snow, etc.. I need to get some good floor mats in there. What has worked for you? - Bill
I am blown away! i have done considerable research & find that there is about zero options for any decent floormats for a GMC 2500HD Duramax/Allison. apparently the floor is a bit different w/ the Allison Trans.
Anyone know of a good resource for floormats?

I am trashing my new rig with stock Mats. I am dragging in the Mud & Snow.
-Bill
AKA: GMCeattle
FYI
Weathertech & Husky both say their product does NOT fit a GMC 2500 Ext Cab w/ Duramax/Allison Trans.
Weathertech & husky BOTh say there is someting about the Allison Transmission that changes the contour of the floor (in comparison to Non Allison Trans models).
I guess I could just buy them & see if they fit, but it is just strange that BOTH companies tell me straight up "they will NOT fit a 2008 GMC2500 Extended cab with Duramax/Allison"....
Do you have a Duramax/Allison? ... i assume so, since your in this forum.
Weathertech says it will NOT fit. Sounds like your sdo.... strange....