8 Speed Auto for HD trucks
Apparently, ZF is making an 8 Speed HD trans that can handle 1000 lb-ft. 2020 release date. I see it as the next trans in the Ram 2500 and 3500s. LINK
Forum Discussion
ib516 wrote:
Something to think about. A GM/Chevy 1500 with the 5.3L and a 6 speed auto is 2 mpg down across the board (city/hwy/combined) EPA ratings wise to the same truck with a 5.3L and the 8 speed auto and cylinder deactivation. So there's something to say for technology and more gears in the trans.
We posts see all the time in these forums when it comes to threads about the power wars in HD trucks:
"I have enough power, how about more mpg?"
Well, what if you could keep the same power and add 2 mpg across the board to your HD diesel?
There was a 3-5mpg gain in 2014 when going from the 4l60E to the 6l90E city freeway useage. Also a reason why I went with the 7 sp over a 6, 5 or 4 sp in my MDT. I was able to keep the engine in a 750 rpm power band, vs 1300 for the 4 sp auto, others in between. Not to mention overall low for those steeper grades etc was better!
Marty
