Well the reasons I didnt buy the one I drove is 1) I just bought my current '07 in November and cant really buy another new one at this point 2) they didnt have a MegaCab Dually, it was a 3500 SRW that was exactly like mine option wise-it was even the same color. 3)I just got my Smarty on today, so I wasnt about to trade it in on the 6. 7. But it started right up, I think it may be slightly quieter under the hood than my 5. 9. There was a little delay in shift selection and the actual shift, but thats kind of to be expected from an auto-stick type shifter. As for the converter, if it slips a little bit I probably wouldnt notice it as I have limited experience with automatics, it would have to be real noticeable.
Unfortunately I didnt really have a chance to get on it to check acceleration compared to the 5. 9 as it mustve been rush hour in small-town wyoming, but it pulled pretty good rolling; I did get on it some down the street from the dealership and broke 'em loose. I laid into it on the one open stretch I had with no traffic and hit 3rd and a sheriff came around the corner-just my luck.
I only put about 2 miles on it because the fuel light was on the whole time, but it was long enough to tell me all I needed-and I may have traded if they had a Mega Dually. As far as perfomance parts, time will tell, but I think it should be a good platform. Id be interested in swapping in the 68RFE in my current truck not real sure what it would take but I think it could possiblly be a popular swap. Sorry I dont have more in-depth details, I kinda had my head in the clouds with having gotten my Smarty on the truck today, and I really wasnt even thinking they would have one I was very surprised, almost shocked when the salesman said they had one. Feel free to ask anymore questions Ill try to answer them to the best of my abilities with the minimal knowledge I have on them.