eheading wrote:
We have had a number of motorhomes with Cummins and CAT engines with the 3000 series Allison transmissions. Our last Revolution LE had the 400 hp CAT. We now have the short Ventana LE with the 340 hp engine with the 2000 series transmission. Yes, it does shift down to 5th gear more than our 400 hp CAT did, but because it is governed at 2800 rpm, I have found that it does as well on hills as our larger engines did. In addition, the 2500 transmission is the smoothest shifting Allison we have ever had. The shift in and out of 4th gear was always a little rough, we can hardly feel this one shifting. In addition I like the 9,5 to 10 mpg compared to our 7.2 in our last motorhome, and I really like the flat floor all the way to the rear closet, a feature which I believe is only available with the 340 hp Cummins engine.
Thanks for that, you're in one of the models on our short list. I am presently of the mind to hold out for Ventana (non LE) to get the Allison 3000. Tiffin REDs but only 2016 onward should have a 3000.
I have seen others who share your perception the 2100 or 2500 shift more smoothly, and that should be the case, considering the use of torque management to pull power during the shift.
I could love the fuel economy of the detuned 6.7, however the GCWR is 33,000 and with our toad we would scale more than that.
