bsinhc50

My truck wasn't seamless at all. I own a 2009 Sierra 4x4 with a 5.3 and 4 speed, & 3.73 gears I bought a year ago. Initially, I thought the AFM was a great thing to have because most of my driving is around town and I'd average 13 mpg. The only thing that seemed odd from the first day I drove it was the transmission which shifted a lot. Then, when the weather got really cold, I thought the tranny was going bad because it began shifting more and the truck would jerk at times, too. Being it came with a GM certified warranty, I took it to the dealer and explained what was happening and said I felt the tranny was going bad. They took it in, checked it out, and the service manager told me it was the AFM causing the transmission to shift a lot and it was normal and not to worry about it. Well, I didn't care for his explanation and felt sooner or later something was going to give so, long story short, after doing some research, I found this forum and another one that talked about the Range AFM disabler. After reading a few posts by people who said there truck seemed to shift better with the disabler on, I went ahead and bought one. It's been on for a week now and honestly, it's like I'm driving a completely different truck. The 4 speed shifts smoothly and there's no more jerking PLUS, my around town mpg has increased to 14.5 which has me stumped because I thought it would go down. Has anyone else tried the Range and are getting better mpg's? I know it's only been on a week and, as time goes on, I'll add updates If I notice any major changes but for the price of the disabler, I feel it's well worth the bucks I spent because my truck is so much better to drive.