It was a good test and was pretty much what I expected. I am a Dodge guy, but I know the transmission's could be calibrated differently. For some reason the Dodge Engineers will not let the Cummins scream around redline when pulling a hill. The tranny will always upshift too early and when the truck loses speed, It can not get it back.
I know the Ford and the GM will hold high rpm on a hill which makes a huge diff.
If the Dodge is shifted manually with the gear select, then it is a totally different deal and it will easily run with the other two. We have seen it over and over.
Completely agree. I always thought it was because of the 4sp 48RFE tranny..that is just didn't have the gear range. Bought a 2010 3500 Mega a few months ago with 10K on it and the 68 RFE. It will wants to lug and doesn't want to kick down as much as I would like it to. Mileage sucks compared to me 04 5.9L. Hoping that the H&S Mini Maxx I have sitting here will help that out.
On a side note..truck has 11K, been in the shop for almost 2 weeks..needs a new valve body and a few solenoids in the tranny. Parts backordered for 3 weeks minimum. Absolutely ridiculous.