I've read lots of posts from folks who complain that their V-10 with the 5 speed Torque Shift trans tends to hunt excessively downshifting from 5th to 4th or even 3rd gear. The Banks system is touted as a solution but never having had the problem I see no need. Perhaps Ford managed to correct this in the 2011 model as that is what my chassis is and I have no such issues whatsoever.
I run with Tow Haul engaged all of the time. The vast majority of our cruising is at 2,200 rpm in 5th gear and about 60- 63 mph At 3,200 rpm I getting the max torque of 420 pounds {max hp comes along at 4,350}, and this is usually sufficient to climb all but the longest and steepest grades in 4th gear.
Once in a blue moon it will downshift to 3rd and the rpm climb to about 4,200 - 4,400 but this usually lasts about a minute, perhaps 2 at the very most. Engine noise is negligible {another complaint you hear here that I do not experience and we do not get excessive heat in the cab either}, go figure. :)
Bottom line I could not be more satisfied with the performance, ride and handling of my E-350, oh by the way... for the last nearly 4 years and 36,000+ miles we have averaged a very consistent 9.5 mpg including 62 hours of generator run time. As a matter of fact it is sitting out front, the frig chilling down nicely as we load for a 5 day trip to the White mountains, leaving early tomorrow morning.
It's just about time to go load the Harley onto the Kendon trailer and head up to Big Lake at 9,200' where highs will be in the upper 70's {but 105+ back here at home}. works for me!
:B