2014 RAM 4500 6.4L

I like the Aisin 6-speed in my '08 4500. It had the 6.7L, but I though the Aisin did great delivering power. I liked in much more than the Allison 1000 in our GMs.

The main thing I did not like was there was no way to lockout 1st gear. It was almost too low for solo driving, since we had 4.88 gears in the trucks.