I've got an 07 Silverado, and until the day I can afford a New D/A or used Cummins- which is probably going to be awhile, it's going to have to be my Tow Rig. Keep in mind it's a Extended Cab Short Bed 2WD. I'm going to add a Tekonsha Prodigy and Firestone Airbags to the rear before I hook up to anything. I also plan on adding a Diablosport programmer and intake, too. Does anyone tow with a similar rig? How about on grades? What am I going to tow? Mainly, a 68 Nova on a 16' trailer, probably around 4500 pounds lightly loaded and 6K when I've got lots of tools, etc. with me. I may also tow an enclosed cargo trailer (probably around 14-16x7) full of Motorcycles and tools, with a trailer weight similar to the first, perhaps a bit lighter. I'm not looking for any comments on the Transmission's life expectancy. It has a decent cooler on it, and it will get a better one before I tow. I leave it out of OD unless I'm going to stay in it, and if/ when it goes out I will have a suitable replacement built and upgrade the TC. I am not expecting this thing to pull like a HD, but it will probably be my towrig for the next few years, so I want to make sure it will get the job done. If it needs it, I will regear to 4.10. The factory tow rating is 7K, which would just cover my K20 on a suitable trailer. I wouldn't be too worried if it was flat out here, but just about any direction that I'll be travelling includes 6% grades.