The G56 is really a pathetic excuse for a transmission in these trucks, opting for an auto is by far the better choice. Exactly oppositie of what it used to be but engine management and trans management has come a long way since the 47RE. For a multi-use truck and the ease of driving the auto cannot be beat.
I guess I had better give my nickels worth on this topic. I currently own 6 trucks with the G56 plus 3 new 2014 trucks with the G56 (A 5500, 3500 and 2500, all 4x4). In my business my trucks pull trailers all day long, up long grades, many times in 4 wheel drive, with shifting loads (cattle) and have not had one single issue with this transmission. I have all kinds of employees that some really arent the best with the clutch and have yet to touch a clutch on any truck. Is the auto (any flavor) easier to tow, of course. You just point the truck in the right direction and press go. I appreciate having the control on the truck. I dont care what they say about controlling the transmission with push button autos, you are still at the mercy of a computer. I just dont like that. Yes, I know I am old school but I have really like the G56 and manual trannies. I would venture a guess that few companies in the US have as many manual trannied trucks as I do. As long as I can buy them I will and realize that my days are numbered because most folks dont want to mess with shifting. I just completed a roundtrip to Oklahoma and back (2500 miles) and got 22.4 MPG highway on my 2500. I get about 19 on my 4.10 dually. Pathetic transmission? I dont think so. Now if only they didnt build the beds on these trucks out of cardboard we would be talking. Have yet to make it past 20,000 miles without a totaled (cracked) bed.