mellis

are there any GM reps out there reviewing this 266 page thread that can offer any support or words of wisdom?? Something more definitive than just, "Sorry about your problems, please feel free to contact your dealer for assistance." This thread is obviously a substantive concern that GM should be aware about at the top floor in Detroit.

RangeTechnology.com They have an icon at the upper left side of this forum page. Keeping it in V8 mode has dropped my average gas mileage by only 1/2 mile per gallon… not an issue for me. Keeps in in V8 mode at all times… which I like. This module does not leave any footprints in your computer… so it won't affect factory warranty. I had some problems initially with it causing some false codes to show up… but I believe they have fixed it for 2014-2015 trucks. So far it has been running fine with no codes… time will tell. WARNING… do not leave the device plugged in for more than 3-4 days without starting your truck… it will drain your battery. My only issue with the truck is the bad vibrations that no one can fix.

This statement posted by STAYBG is not true for my truck… I have the same vib issues that everyone here has described within this thread. The V4 mode is not the culprit. I have the Range deactivation module, which keeps the truck in V8 mode all the time. The vibration issue in my truck are still there in V8 mode. I have not tried to correct my vib issues yet because I'm afraid that I will just go thru the same run-around with the dealer and GM that everyone else has gone thru… not worth my time right now. But I do have a troubleshooting strategy that someone can try if you have access to the proper tools: 1. Run the back tires on a dyno wheel at all speeds. This can help to confirm/eliminate the possibility of small road imperfections that some people have mentioned could be transmitted to the seat, floorboard, and steering wheel. 2. If the issue is still there, then change rims and tires. 3. Disconnect the rear driveshaft, and run only the front tires on the dyno in 4WD mode as mentioned in steps 1 and 2. 4. Now do steps 1, 2, and 3 except this time not on a dyno, but on a lift. This will eliminate vibrations from road imperfections, possible flat spots on the tire, and drive shaft angle. If any of these conditions make the vibration go away, then we know it isn't in the shaft angles, rear end, motor mounts, transmission. This may not solve the problem, but can help to eliminate some proposed culprits.