Aisin towing

[Oldroostman]

When towing ,I notice the transmission sometimes wants to up shift into a overdrive gear,where it seems to lug a bit more then I am used too. To prevent this condition I use the ers on the shift lever to lock out either the first overdrive 5th , or the 2nd overdrive 6th.am I doing the right thing? Or should I put it in drive and let the computers run it all .

 

[Cummins12V98]

Do what works for you. It won't over rev. I toggle mine down anticipating hills I can see before the computer can feel them.

 

[Oldroostman]

Thanks,that's what I've been doing.

 

[Hoefler]

I have found that the Aisin has quite a bit different torque management programing compared to the 68rfe. It will pull like a mule at 1600 rpm on up. It will stay in 6th pulling our 40' 5ver were the 68rfe would down shift. Put it in drive, let the computer do its thing and sit back and enjoy the ride, it will amaze you!

 

[kthaxton]

I have found that the Aisin has quite a bit different torque management programing compared to the 68rfe. It will pull like a mule at 1600 rpm on up. It will stay in 6th pulling our 40' 5ver were the 68rfe would down shift. Put it in drive, let the computer do its thing and sit back and enjoy the ride, it will amaze you!

Are we talking same gear ratio and engine output between your two trucks?

 

[Mingoglia]

I have found that the Aisin has quite a bit different torque management programing compared to the 68rfe. It will pull like a mule at 1600 rpm on up. It will stay in 6th pulling our 40' 5ver were the 68rfe would down shift. Put it in drive, let the computer do its thing and sit back and enjoy the ride, it will amaze you!

I've noticed the same thing. Granted, I'm only at about 22,000 combined. I know others are much heavier. I'm surprised how long it will keep a gear and just how low it will chug up hills before wanting to shift. It also makes a nice sounds when it's chugging as well. Nice and deep and throaty.

 

[Oldroostman]

Appreciate the input guys,I just know that lugging will result in high egts .makes me wonder why it always wants to jump into a overdrive gear when loaded.

 

[Newsa]

Stock (non-modified) Cummins will stall out before generating EGT'S that are too high.

Never heard of anything warping or melting in a stock Cummins. If anyone has, please prove me wrong.

Same philosophy goes in my Cummins fitted with the G56.

 

[sag2]

On a stock truck you do not have to be concerned with EGT. Just drive it as hard as you want, you can't hurt anything.

 

[Cummins12V98]

On a stock truck you do not have to be concerned with EGT. Just drive it as hard as you want, you can't hurt anything.

ZACTLY! When I come to a grade the foot is pressing the floorboard!

 

[Gonzo 1066]

I assume that the computer is programmed to learn your driving habits. My 2013 has done just that.

 

[phxpsd]

I just pulled my Grand Design 380(19,000lbs) to Silverton, Colorado, and noticed it wanted to upshift, especially at higher altitudes. So I just locked it in to 4 or 5, whichever gear seemed appropriate. Awesome truck.

 

[Hoefler]

Are we talking same gear ratio and engine output between your two trucks?

My 2010 with the 68rfe had 4.10's
My 2014 with the Aisin has 3.73's
Same trailer, same routes, the 14 will out pull the 10 and get better fuel mileage while doing it!

 

[kthaxton]

My 2010 with the 68rfe had 4.10's
My 2014 with the Aisin has 3.73's
Same trailer, same routes, the 14 will out pull the 10 and get better fuel mileage while doing it!

I'm betting the increased torque of the '14 had more to do with it than the trans itself.

 

[MJWenrich]

My 14 with 342 gears drops to 5th when the slightest hill is encountered. This includes freeway undercrossings. Unladen or not. It's rather annoying so when coming back from the valley as soon as I encounter hills I drop it into 5th. But that brings a question to mind that I have been curious about. The OP mentioned the lockout of overdrives and I have noticed a plus and minus on the shift display but have never been able to determine or detect anything but the 6 plus and 5th minus, and so on. How does one set plus or minus? I tried toggling and watching rpms but cannot seem to get it to lock in. It will still downshift on it's own when I drop speed.

 

[kthaxton]

If it shifts down to 5th when unloaded on the slightest of hills, I'd say you've got something wrong (unless you've got big tires). See my thread "Down on Power" on this page as mine started doing this too but only after about 7-8 months of ownership. Currently, my truck is at the dealer for the second time, last week they just reflashed the PCM but it didn't fix a thing. I'll update it when I get the truck back.

As for the rest of your question, I admit it is kind of confusing and I'm not sure I'm following you. You start off by saying you "drop it into 5th" which makes it sound like you know exactly what the plus or minus button is for. Basically, it allows you to choose the highest gear the trans will shift to and it will shift all other gears as normal up to that point. If I remember correctly, the + and - are only an indication of which way you can go (up, down or both), but since I don't have my truck right now, I can't verify.....but really, the number is all that matters. If it says 4 and 5, that means you are in 4th but it is set to a max of 5th.

 

[Hoefler]

Running tow/haul makes a huge difference. I have mine on 100% of the time the truck is running, regardless of load.

 

[Doubleclutch]

Mike- Could you be looking at T/C status, locked vs unlocked?

 

[MJWenrich]

The first post made it sound like there are two modes for the plus/minus. Maybe the symbols I am seeing are as kthaxton described and I am guessing there is more to the shift button than really exists. If I recall, when I press the button on the shift lever once, it brings up the display for the current position with a plus sign. Then a minus as I go down to fifth. So maybe it's just telling me direction assuming I cannot count to 6 either direction. After a couple beers I do have problems with that but it's usually speech related. I will play around with it.

As for the downshift, yes I believe I have a problem because I also have the dead pedal issue. Even after putting on the BD Diesel pedal device, which greatly improved the low end power, it still has the terrible lag when trying to pass a car. The device did not help the 4 second delay to get full power and downshift from 5 and 6 gears. So I am in the habit of ramping up and down shifting before a pass. At least I won't be killed trying to enter traffic but all the reflashes have done nothing for the issue. Love hate relationship with the truck because of this and Ram won't fix it. Now I have to go back for a steering problem. AAAAARGH!!!!