Future Trans Options, 8 sp ZF? - Dodge Cummins Diesel Forum
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post #1 of 64 (permalink) Old 04-12-2017, 05:30 PM Thread Starter
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Future Trans Options, 8 sp ZF?

Lots of you folks know follow this stuff more closely than I do, so I figured Id ask...is the new Demon tranny based om the 8sp ZF? If so, sure seems like it can ne built to hold power...I know torque is a different animal, but still...quite impressive. Do you guys think we will see a trans based on the 8sp ZF in our trucks in the future? If so what are your thoughts?

Seems like it might be a good fit. And with programming it could probably be operated in several modes...econ, sport, race, tow, etc...

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post #2 of 64 (permalink) Old 04-12-2017, 05:37 PM
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Hope not. My truck is constantly shifting as it is. I hear a few complaints about the 8spds in Jeeps.

In my mind I'd go nuts. I would think to myself "welp there it goes again, yup just shifted again..oh yup another shift again"

I'm used to it in my kenworth (10spd) but if I'm not towing I would hate it.
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post #3 of 64 (permalink) Old 04-12-2017, 05:44 PM
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Demon is 770 torque, and at a much higher rpm than the peak on the Cummins.

I can't see the 8HP90 being able to be modified enough to handle the 1000 ft lbs that will eventually come to the Cummins 6.7. It would have to be a whole new trans, that would be an expensive proposition. Would be something if it happens.

They will have to come up with something to handle that torque, we'll see what they end up doing.
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post #4 of 64 (permalink) Old 04-12-2017, 05:45 PM
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Hope not. My truck is constantly shifting as it is. I hear a few complaints about the 8spds in Jeeps.

In my mind I'd go nuts. I would think to myself "welp there it goes again, yup just shifted again..oh yup another shift again"

I'm used to it in my kenworth (10spd) but if I'm not towing I would hate it.
Not necessarily, from what I've read of the new 10 speed F150, it might go through all the gears or if you get on the gas it'll skip gears. More gears can give the engine better opportunity to be in the ideal RPM.

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post #5 of 64 (permalink) Old 04-12-2017, 05:47 PM Thread Starter
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Hope not. My truck is constantly shifting as it is. I hear a few complaints about the 8spds in Jeeps.

In my mind I'd go nuts. I would think to myself "welp there it goes again, yup just shifted again..oh yup another shift again"

I'm used to it in my kenworth (10spd) but if I'm not towing I would hate it.
Lol cool that you drive a semi...been my dream to one day buy one

I was thinking that all 8 gears wouldnt be needed most of the time. Especially with that kind of torque...like you guys mentioned though, itd have to be a heck of a build to handle it.

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post #6 of 64 (permalink) Old 04-12-2017, 06:17 PM
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An 8 speed, or 9 or 10, would be good for fuel economy. But, as I stated, the cost to develop a new trans of that nature would be very high.
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post #7 of 64 (permalink) Old 04-12-2017, 06:50 PM
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Not necessarily, from what I've read of the new 10 speed F150, it might go through all the gears or if you get on the gas it'll skip gears. More gears can give the engine better opportunity to be in the ideal RPM.
True, but when you're skipping gears it kinda defeats the purpose of having more gears.

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post #8 of 64 (permalink) Old 04-12-2017, 06:57 PM
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True, but when you're skipping gears it kinda defeats the purpose of having more gears.
I disagree. Depending on what speed you're towing at for example, the transmission could have more gear options to optimize your RPM. There's no need to shift through ALL gears all the time. There could even be a wider ratio overall with more gears so you could have a nice low RPM at higher highway speeds for example.
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post #9 of 64 (permalink) Old 04-12-2017, 07:52 PM Thread Starter
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I disagree. Depending on what speed you're towing at for example, the transmission could have more gear options to optimize your RPM. There's no need to shift through ALL gears all the time. There could even be a wider ratio overall with more gears so you could have a nice low RPM at higher highway speeds for example.
True, for towing all the gears would be nice, keep the engine right in max torque all the time. And as someone else mentioned it would help fuel economy.

Those semi truck auto manuals seem like an interesting proposition. I always wondered why they never built manual trannys that were shifted automatically. I figured maybe they couldnt shift quick enough to handle normal driving...but Ive seen how they work in the semi trucks and they seem to shift quickly...and holding power isnt an issue for those big diesels pushing 1800 lb ft...

I just remembered the VW auto stick. Dated a chick in high school that had one...that thing blew my mind. I need to google how those worked...



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post #10 of 64 (permalink) Old 04-12-2017, 07:55 PM Thread Starter
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An 8 speed, or 9 or 10, would be good for fuel economy. But, as I stated, the cost to develop a new trans of that nature would be very high.
Yeah the cost, spot on thats the issue I bet. Then again why not spend the money for the best solution out there? If u build it they will come lol

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post #11 of 64 (permalink) Old 04-12-2017, 08:02 PM
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Lol cool that you drive a semi...been my dream to one day buy one

I was thinking that all 8 gears wouldnt be needed most of the time. Especially with that kind of torque...like you guys mentioned though, itd have to be a heck of a build to handle it.

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Originally Posted by chuckie2.oh View Post
True, for towing all the gears would be nice, keep the engine right in max torque all the time. And as someone else mentioned it would help fuel economy.

Those semi truck auto manuals seem like an interesting proposition. I always wondered why they never built manual trannys that were shifted automatically. I figured maybe they couldnt shift quick enough to handle normal driving...but Ive seen how they work in the semi trucks and they seem to shift quickly...and holding power isnt an issue for those big diesels pushing 1800 lb ft...

I just remembered the VW auto stick. Dated a chick in high school that had one...that thing blew my mind. I need to google how those worked...



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As for the auto manual that's what I have. It's an eaton fuller 10spd. If they did something like that in a ram I dunno how the market would respond. You bring up a good point about shifting characteristics in normal driving. When I'm unloaded it skips gears so I guess it could work. It would have to be one hell of a redesign. Possible..sure why not. The direction trucks are heading I wouldn't be surprised
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post #12 of 64 (permalink) Old 04-12-2017, 08:38 PM
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The way trucks are going I'm waiting for them to be like trains, with a diesel that runs a gen set at a set rpm and electric motors on all four corners.
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