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  #1  
Old 08-06-2013, 10:27 AM
mattieb mattieb is offline
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Default EcoDiesel gear ratio

I understand the correlation with gears and the HEMI, and why the higher RPM's are needed to reach max torque with gas engines so lots of people are opting for 3.92's, but if I'm going with the Ecodiesel, how big of a role will different gear ratios play, since max torque is reached at a much lower RPM?

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Old 08-06-2013, 10:53 AM
crabjoe crabjoe is offline
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It's not just about spinning the motor or at what motor speed torque is available. 3.92s will be easier on the rest of your drivetrain too... especially when carrying for towing heavy weights.

Think about it in terms of a 10 speed bike. No matter how strong the rider is, it's still easier for them with that smaller gear.
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Old 08-06-2013, 06:22 PM
mattieb mattieb is offline
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So the lower gears are just as beneficial for the diesel then? Thanks. I'll be pulling my 26' camper, so whatever I can do to make it easier...

My Dakota with the 4.7 does it now, but it's past time to upgrade.
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Old 08-06-2013, 09:57 PM
crabjoe crabjoe is offline
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Think about this.. You can get Ford/GM/Ram 3500/4500/5500 trucks where gears are in the 4.xx.. If they weren't needed, because of the low end torque, I doubt people would order them or even be offered.

The nice thing about most diesels isn't just the low end torque, it's that they tend to have high torque, down low, and it stays though out the RPM band. Gas motors tend to hit that peak torque number then drop off....
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Old 08-07-2013, 09:12 AM
mattieb mattieb is offline
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While that's all true and well, one of the points of opting for diesel is to do the same as the gas but at a lower RPM, since you're going to redline around 3500 anyway. It makes sense to me that you'd want to gear it so that you stayed in the lower RPM range to make the most of the benefit.

The 8 speed probably reduces the importance of gearing, but it'd still be nice to get whatever help is available to make the most of it.
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Old 08-07-2013, 03:46 PM
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Keep in mind, this diesel is not like the bigger ones, it is modern, high performance diesel. It will probably behave like a torquey gas V6, and will rev close to or above 4500 rpm. I'd imagine the gearing being the same as a gas engine, especially with the 8 speed.

And as written above, just like any other truck, lower gears will help it with loads, or even just with acceleration. Expecting the transmission to do the extra work of lower gears will shorten the life drastically.
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Old 08-07-2013, 10:21 PM
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I'll be ordering the lowest gear available. The TF8 has a double od which really makes highway rpm a non issue even with the 3.92
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