Why a 10 speed transmission?

I had a lot of exactly that on my first trip out of town with my truck. 250 miles each way across South Georgia. Probably half of the trip was quite flat.

I see this truck get amazing economy at the 45-50 mph range. Saves the overall trip average to meet what I did get on the trip. That’s really my point as at 70mph, this truck seems to get what the V8’s were known to get.

I’m not mad, just confused. And disappointed as this truck absolutely will not attain the economy numbers as advertised. I watched a video on YT, with a principle engineer that talked of the 2 years designing this truck. So many things thought of. Like the small little aerodynamic snails (I really don’t know what to call them, like above the rear tail light housing), incorporated to help move air around the truck for smoother travel to increase economy. The bed/cargo light assembly design to aid in keeping air from the bed area blowing anything back into the cab rear window when down. All the testing done in the wind tunnel to reduce drag to improve its fuel economy. Just to virtually never use a 10th gear in the transmission. Call me dumb for being concerned about an advertised product not being used as it is advertised to “be”.

Again, I very much like this transmission and believe it to be a fine piece of engineering. Let us use all of it, even if only in a manual method with the shifter.

Respectfully,
Mike

 

Those numbers are NOT interstate numbers. It does get the advertised numbers at the slower speeds. That's what I was saying. You cannot expect that at interstate speeds because that's not what highway MPGs are. Highway is 45-65.

 

these trucks drop mpg fast at 70+. , still a big brick , can’t get around it

still good though for what it is, way better than my old one

but piss on all that, boost is fun, when it gets empty fill it with 93 octane !

boost on

 

Here in NM where the interstate speed limit is 75 - and that seems like a suggestion rather than a limit - you will use all 10 gears.

This is one of Aisin’s best transmissions ever built IMO

 

one of my best friends has a 2021 SR5 and he gets 12mpg average. 14 at BEST on highway. I got 19-20mph doing 85 heading south with the wind to my back. No vehicle will get its advertised MPG doing over 65mph.

 

My truck often starts off in 4th gear and rarely uses 10th, but the option is there if desired. Better to have a 10th gear that's rarely used--but available--than have, say, a top gear that runs out of breath at 70. I am very impressed with this transmission--enough so that it doesn't make me pine away for a manual.

 

Lol, if you want more than 4 gears on a slushbox, the converter is going to be unlocked, and its going to hunt.

Yall got shift buttons? Cause i have to fondle the O/D button, and be careful with the lever if i want 1st or 2nd. But in second it holds pretty predictably, 3rd doesnt happen until 40 & i cant get lockup under 45. Might try to swap in a manual, but i've gotten pretty deft at my trans dance.
The titan had a shifter mounted toggle thats pretty good, but the excess power doesnt really take as much tact, so it isnt as engaging. Timing my own shifts with the tundra brings the right noise at the right time & i can imagine the applause by nearby drivers that get to hear the song.

 

Should have got a Ferd V8.

 

you're gonna have to say it way slower than that.

 

nah, Aisin 10 is light years better than the class action ford 10, or wait was that GMs class action 10? HAHA

 

Eh, we'll see how it goes. Wonder if I could get the Aisin swapped into the Ferd.

 

I have hit 10th gear occasionally even with torque converter lockup on my way to work but that’s only because the roads are dead and you can find the trucks sweet spot mpg wise while maintaining a decent speed. I hold the throttle around 25 mpg going 75 mph and after lock up I just cruise getting good fuel economy. The truck won’t always do this if transmission or engine is still warming up and will use 9th to be more efficient given the conditions. I wouldn’t worry about it too much since 9th gear drives perfectly (enough wheel torque) for 60-75 mph and your engine speed will be under 1700 rpms giving you a nice quiet ride.

 

Yep, mine hits 10th all the time on the interstate. Even handles mild hills in 10th. 1800 rpm at 80 or 85 mph (I didn't write down which and slept since then). That's in eco drive mode.

When cruising, observe your rpm, pull the shifter over to "manual" and it (mine anyway) downshifts to S8 (watching the rpm) then push the shifter up a couple of times and it will go to S10, and the rpm will match what it was before you pulled the shifter over. It runs there (S10) all the time at highway speed.

 

S10 doesn't mean it's in 10th. All S-mode does is limit the top gear. It could be running in 9th.

 

Or just forget all that shit and boost it

 

That's why you put it in "manual" and it drops to S8 (8th). Push it up to where it says S9, watch the rpm's drop, when it stabilizes push is up to S10, and watch the rpm's drop further. Not gonna happen that way if you're going too slow, or if you're going uphill enough or with a strong headwind or much larger diameter tires.

Or, I guess you could be saying that when you drop it to S8 you're really in 7th(?). What are you saying?

P.S. Or keep drinking fluoride.

 

that’s not the way that works

Whatever you select is the top gear lock out and it changes shift points

so if you select 8 n your example your top gear is now 8 with a slightly different shift pattern

it’s limiting the shift range technically

 

Right. So if you're on the level on the freeway and you pull the shifter over to the left it will downshift, into 8th. It says S8. Then you push the shifter up (forward) once and it says S9 and the rpm's drop. Then, after the rpm's stabilize you push it up one more and the rpm's drop again and it says S10. Not sure what's hard to understand about that, unless you don't know what a tachometer is.

 

The point being made is that it saying S10 doesn't mean it's in 10th gear. It doesn't have a "manual mode" it's just a gear limiter. It can say S10 and you can be in 4th gear.

The post I originally replied to didn't say anything about counting the shifts, and tons of people assume the S# is the gear it is currently in. I was making sure you understood that S Mode is not a manual mode. I was not saying you weren't in 10th because the original post didn't have enough info to confirm or deny that. It wasn't possible to tell if you were actually in 10th based on the info you presented; just as it was impossible to tell if you actually understood the function of S Mode.

 

I agree with you mostly, except that if you watch the tachometer you can tell.

 

Yes. Not disputing that. It just wasn't clear in the first post. You said it matched what you had previously, but if it was previously in 9th you could match it there. Your subsequent posts clarified your process.

 

Well. Well. Well.

I had a nice lengthy highway trip today. It did go into 10th gear, but will NOT unless you are 80mph or higher. Now, it will stay there down to around 75 unless I tried to accelerate back up to 80 too quick. The converter would lock and unlock moderately and I did not see even the slightest difference in RPM when it did. Not sure how much slip is actually in the converter at that power and speed level. And the 9 to 10 shift is very tiny in RPM change. 8 to 9 shift is way more drop in RPM. 10th gear is truly just a small difference in gearing inside the transmission.

I just don’t think it needs to be at 80mph to finally shift into that 10th gear.
However, I did actually get right at 19mpg on this trip going 80 most of the way.

Mike

 

I don't have a scanner but I'm at 1750 rpm at 85 mph that's 10th gear I assume. Also anybody felt transmission hesitate and shudder when you put your foot hard down for an overtake?

 

you are right in mph and rpm in 10th gear. BTW, 9th gear would be prolly 1800 rpm. That’s how small a difference it is between the two gears.

Mike