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View Full Version : Help With Quirky Transmission UPSHIFT


Crash
02-20-2007, 05:58 PM
Just drove back from Santa Fe in the 80 after a long weekend and we set an all-time record low for trip duration. What's even more surprising is how effortless the trip was and how the comfortable ride left us feeling like we were just getting started as we entered the Denver traffic. That quickly reminded us of how happy we were to be near home. Anyway, on to the not-so-serious quirk noticed during the drive.
This occurred with regularity at hiway speeds of around 70-75mph. O/D and cruise control on going up a long grade that forced an automatic tranny downshift. When the long grade was crested and it was time for an upshift back into 4th, it wouldn't occur for 10 to 20 seconds after the time I thought it should have. Easily overridden by clicking the CC off and then resuming but it there any adjustability of the CC parameters that prevent the tranny from upshifting sooner? Remember, this question is from an owner that is used solely to a hydraulically activated A440F.
Thanks.

Uncle Ben
02-20-2007, 06:03 PM
Just drove back from Santa Fe in the 80 after a long weekend and we set an all-time record low for trip duration. What's even more surprising is how effortless the trip was and how the comfortable ride left us feeling like we were just getting started as we entered the Denver traffic. That quickly reminded us of how happy we were to be near home. Anyway, on to the not-so-serious quirk noticed during the drive.
This occurred with regularity at hiway speeds of around 70-75mph. O/D and cruise control on going up a long grade that forced an automatic tranny downshift. When the long grade was crested and it was time for an upshift back into 4th, it wouldn't occur for 10 to 20 seconds after the time I thought it should have. Easily overridden by clicking the CC off and then resuming but it there any adjustability of the CC parameters that prevent the tranny from upshifting sooner? Remember, this question is from an owner that is used solely to a hydraulically activated A440F.
Thanks.

Sounds like you had the "Power" button pushed?

Convert
02-20-2007, 07:02 PM
Sounds like you had the "Power" button pushed?

I would agree:thumb:

Crash
02-20-2007, 08:04 PM
Sounds simple enough and thanks for the idea. Is there an indicator that reflects the button being engaged or is it a feel thing of the button action? I haven't explored that feature yet and guess that I will be soon. I guess the 62 has spoiled me with its simplicity!! :hill:

bvb
02-20-2007, 08:31 PM
CC logic holds the lower gear based on throttle angle from 10-30 seconds after attaining set speed, to prevent excessive shifting. Tap the accel or decel once and the shift usually occures instantly. Welcome to the electronic world!:beer: :beer: :beer:

Uncle Ben
02-20-2007, 08:34 PM
Sounds simple enough and thanks for the idea. Is there an indicator that reflects the button being engaged or is it a feel thing of the button action? I haven't explored that feature yet and guess that I will be soon. I guess the 62 has spoiled me with its simplicity!! :hill:

There is an indicator on the cluster but it is possible the bulb could be burnt. The button will stay low when on and higher when off. That is what the Power button does is raise the shift points. I leave mine on all the time unless I'm cruising down the highway.

Hulk
02-20-2007, 09:46 PM
Yeah, I still need to replace my "D" bulb. The rest of the lights work fine.

Hants
02-20-2007, 09:47 PM
Hmmmm, I've noticed exactly the same behavior when cresting hills at highway speeds... I never connected it with use of the Power button, though. Makes sense, and mine is always on to compensate for the 285's.

nakman
02-20-2007, 10:18 PM
CC logic holds the lower gear based on throttle angle from 10-30 seconds after attaining set speed, to prevent excessive shifting. Tap the accel or decel once and the shift usually occures instantly. Welcome to the electronic world!:beer: :beer: :beer:

BVB is all-knowing.. :bowdown: :cool:

You either need to tap the throttle at the top, or turn off the cruise control at the bottom of the hill, otherwise it'll hang in 3rd. Power button will make it worse, since the shift point is higher, but it's not the power button. Ever notice that you can't shift into OD when the truck is cold? Yes, your transmission has a brain too.. ;)


edit: IOW, it's a feature, not a defect.

corsair23
02-21-2007, 12:42 AM
Ever notice that you can't shift into OD when the truck is cold? Yes, your transmission has a brain too.. ;)


Timely information...I was thinking maybe I had a problem lately (just now getting to drive the LX) while cruising around town and it didn't seem like the LX wanted to shift into OD. I'll have to keep an eye on it and see if what I've been noticing only occurs when the truck is cold...I'm used to the Durango which kicks into OD early and often.

Crash
02-21-2007, 05:32 PM
Yes, yes, yes. BVB's response, in addition to yours, Tim, seem most logical as I didn't notice any similar symptoms with the CC inactive and I just checked and the power button was not engaged. Now I need another road trip to prove them out. Hell, I just need another road trip!! I did overrride the CC after it became obvious that 10-30 seconds of being in the lower gear when not necessary became too much of a pain to tolerate. Now that I know the CC overhang is a common thing I will manually adjust accordingly. I did read the owner's manual enough to be aware the OD was temp sensitive. Suzie gave me an early B-day present of an 80 FSM so I will soon know more which may be a good thing.
Thanks for all of the input and I'm sure there will be further questions.
:cheers:

BVB is all-knowing.. :bowdown: :cool:

You either need to tap the throttle at the top, or turn off the cruise control at the bottom of the hill, otherwise it'll hang in 3rd. Power button will make it worse, since the shift point is higher, but it's not the power button. Ever notice that you can't shift into OD when the truck is cold? Yes, your transmission has a brain too.. ;)


edit: IOW, it's a feature, not a defect.

Cheeseman
02-21-2007, 09:08 PM
Boy Steve you and Suzie sure have earned the 80 all right. But it is interesting how the learning curve starts all over again. It is fun to learn more. And now more shelf space for another FSM.
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