10 Speed Auto
In my old 5.4L, the 4-speed was pretty sad. 3rd gear seemed just never right. Going up a moderately steep hill at 70-75 mph, the transmission would almost always shift all the way down to 2nd gear. And, when going downhill, 3rd gear was just not low enough to provide adequate engine braking. The new 6-speed hardly ever gets below 4th on uphills and 3rd gear is pretty good at engine braking on downhills.
But 10 speeds? I'm back to wondering why not just go to "Continuously Variable"?
- Jack
The new 10 speed gearbox (and some of the 8 speeds) works like a continuously variable but without all of the suckiness of a CVT. Under normal acceleration it will act like a normal tranny but only use every other gear. However, when needed it can use the in-between gears to keep the engine in the heart of the powerband. The reason behind this is to let a smaller engine replace a larger one. In something like the EB it doesn't provide as much of an advantage since the powerband is so wide.
I have to agree. Ten forward gear speeds seem way too complicated. However, I wasn't sure about the 6-speed transmission either, after driving it in my 2014, I'm really happy to have it. Coupled with the EcoBoost, it seems a perfect combination of gear ranges.
In my old 5.4L, the 4-speed was pretty sad. 3rd gear seemed just never right. Going up a moderately steep hill at 70-75 mph, the transmission would almost always shift all the way down to 2nd gear. And, when going downhill, 3rd gear was just not low enough to provide adequate engine braking. The new 6-speed hardly ever gets below 4th on uphills and 3rd gear is pretty good at engine braking on downhills.
But 10 speeds? I'm back to wondering why not just go to "Continuously Variable"?
- Jack
In my old 5.4L, the 4-speed was pretty sad. 3rd gear seemed just never right. Going up a moderately steep hill at 70-75 mph, the transmission would almost always shift all the way down to 2nd gear. And, when going downhill, 3rd gear was just not low enough to provide adequate engine braking. The new 6-speed hardly ever gets below 4th on uphills and 3rd gear is pretty good at engine braking on downhills.
But 10 speeds? I'm back to wondering why not just go to "Continuously Variable"?
- Jack
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The new 10 speed gearbox (and some of the 8 speeds) works like a continuously variable but without all of the suckiness of a CVT. Under normal acceleration it will act like a normal tranny but only use every other gear. However, when needed it can use the in-between gears to keep the engine in the heart of the powerband. The reason behind this is to let a smaller engine replace a larger one. In something like the EB it doesn't provide as much of an advantage since the powerband is so wide.
In a HD Truck I was reading that's it's not easy to make a 8speed or higher trans that can take the abuse of HD work that a 3/4 or a 1 Ton can dish out. The six speed is tops right now for HD trucks. I'm sure in several years they will figure it out but just don't be the first Guinea pigs who test them . Lol
I may have said this before, but I'll say it again if I have. My DD car is a 2013 Honda Accord, 4 cyl, with the CVT powertrain. I like it. It has all the passing power I need, and I drive a lot on 2-lane highways. It's quiet and smooth. I also get about 32 mpg.
So, I imagine CVT quality might vary with car manufacturer.
- Jack
So, I imagine CVT quality might vary with car manufacturer.
- Jack
In a HD Truck I was reading that's it's not easy to make a 8speed or higher trans that can take the abuse of HD work that a 3/4 or a 1 Ton can dish out. The six speed is tops right now for HD trucks. I'm sure in several years they will figure it out but just don't be the first Guinea pigs who test them . Lol
I may have said this before, but I'll say it again if I have. My DD car is a 2013 Honda Accord, 4 cyl, with the CVT powertrain. I like it. It has all the passing power I need, and I drive a lot on 2-lane highways. It's quiet and smooth. I also get about 32 mpg.
So, I imagine CVT quality might vary with car manufacturer.
- Jack
So, I imagine CVT quality might vary with car manufacturer.
- Jack
What that really means is the automakers don't have one one the shelf they can drop into a medium duty truck. There's plenty of auto boxes with more than 6 gears that can more than handle the requirements. The Volvo I-Shift, for example, has 12 gears and can be bolted to their biggest engine. Allison makes an entire lineup of automatic semi transmissions too as well as Mack and others. It's not that they can't do it, they just haven't yet.








