ib516
Jun 24, 2018Explorer II
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
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valhalla360 wrote:wilber1 wrote:Me Again wrote:
Maybe Diesel/Electric will take over like Locomotives and Ships!
Basically that is the Volt, except it isn't diesel and it has a battery pack to store energy.
The Volt is a drastically different solution from a diesel/electric train even though there are some parallels the reasons and benefits have little to do with each other.
Me Again wrote:
So you are saying they are now throw away trucks? A Cummins engine can go a million miles. Wonder how many transmissions that will take?
valhalla360 wrote:Me Again wrote:
Rebuilding a 47RE cost around 3-4K. Rebuilding a 6 speed 68RFE cost 7-8K. Not sure on Aisin, as I have not heard of a rebuild. Rebuilding a 6R140 or Allsion 1000 6 speed are similar in the 7-8K range.
Image what a 10 speed will cost to rebuild!!!!
99.9% of new truck buyers will never rebuild the transmission. Most of the 0.1% that do will have it covered under warranty.
Manufacturers build vehicles for new car buyers and 2nd & 3rd owners with 200k mile trucks are not a priority.
Me Again wrote:
Rebuilding a 47RE cost around 3-4K. Rebuilding a 6 speed 68RFE cost 7-8K. Not sure on Aisin, as I have not heard of a rebuild. Rebuilding a 6R140 or Allsion 1000 6 speed are similar in the 7-8K range.
Image what a 10 speed will cost to rebuild!!!!
hone eagle wrote:
as a point of interest because its not apples to apples, my volvo has a 12 speed (automated with 2 reverse)but never uses all the gears.
It can sense the load (very light) starts in 3 almost 99% of the time then skips the next 1 or 2 gears.These new transmissions may do the same, they have every possible gear for all conditions.
Does anyone know it they skip shift?
Me Again wrote:
For big trucks, the gear count came down not up as engine tuning increase the power ban in some cases. We had 5x4 and 5x3 transmission setups with a 5 speed main tranny and a 4 or 3 speed brownie. Creating 20 or 15 forward gears. Then the 13 speeds in one box, down to 9 as power bans increase in widths. Eaton Autoshift has 18 gears forward a 4 in reverse, and a clutch to start moving, not a torque converter.
It is a mixed bag depending on application.
Here is a write up on what is happening in heavy duty trucks.
https://www.truckinginfo.com/154981/transmission-trends
For pickups going from 4 speed autos to 6 was a great improvement. Ford and GM/Allison started in 2000ish with 5 and switched to 6. I am not sure in the HD pickup arena the that going to 8 or 10 will make a large improvement like going to 6 did.
For a hand full of users like Cummins12V98 having another OD for freeway cruising would be a benefit, however delivering power via a .50 to 1 third overdrive might be self defeating.
The question remains do diesel trucks need more gears within the same range as the 1-6 ratios that we have now. For my use, the answer is no. Better programming to assure the combination was always in the best gear for the conditions might be more beneficial than more gears(that would require similar programming to be effective).
The RAM/Cummins in the pipe line(for 2019 r 2020 models) with all smog stuff down stream of the engine, might be a much bigger improvement to mileage than any transmission change.
Grit dog wrote:monkey44 wrote:
HAHAHA == pretty soon we'll be spending all our time in the shifting mode, and no time in the driving mode. Can't wait for the announcement:
Ladies and Gentlemen, start your engines - we now have a twenty-speed Allison for your shifting pleasure.
Drive an 8 or 10 speed and get back to us.....
monkey44 wrote:
HAHAHA == pretty soon we'll be spending all our time in the shifting mode, and no time in the driving mode. Can't wait for the announcement:
Ladies and Gentlemen, start your engines - we now have a twenty-speed Allison for your shifting pleasure.