I'm considering installing a us gear overdrive, www.usgear.com and I was wondering if anyone has installed one, and if so, how do you like it. According to the website its good up to GVCW of 35000 lbs, torque 2000 lbs, and can be used with a exhaust brake. Since its installed between the transmission and transfer case (my truck is 4wd) it can also be used in 4wd, (unlike the gearvendors which cannot be used with a exh brake or 4wd. ) I have a 2007 2500 4wd with 6speed.