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  #25  
Old 06-06-2013, 07:33 PM
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I have seen the vehicles get driven away from the line at a pretty good clip (not at JNAP but a GM plant).... wonder if the problem Tranny's just learned some bad habits that you made them forget?
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  #26  
Old 06-06-2013, 10:37 PM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

I did the 30 minute battery reset tonight and took a test drive. Yep, way better. Still a few bumps downshifting to 2nd gear, but not a clunk like before. I would say 90% of the shifts were perfectly smooth. We'll see if it stays this way.
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  #27  
Old 06-07-2013, 08:14 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

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Originally Posted by bill_de View Post

If it stays this way they should be naming a Star case after you.
Call it..."The Sean Transmission Reset".



Going on 5 days now, and my transmission is still shifting like a pro...even in "ECO" mode...smooth as butter.

I learned this trick from my Subaru days when you had to reset the ECU with every new engine modification.
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  #28  
Old 06-07-2013, 08:23 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

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Originally Posted by GCLimited View Post
Call it..."The Sean Transmission Reset".



Going on 5 days now, and my transmission is still shifting like a pro...even in "ECO" mode...smooth as butter.

I learned this trick from my Subaru days when you had to reset the ECU with every new engine modification.
I wonder if doing this will get rid of some of the non transmission glitches. If it stops raining today I think I'll give it a try. The way my garage/workshop is set up there is only room to open the driver's door.




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  #29  
Old 06-07-2013, 08:27 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

After resetting mine last night, the drive to work today was very smooth. Eco mode even shifts faster and doesn't lag so much.
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  #30  
Old 06-07-2013, 10:55 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

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Originally Posted by studio1930 View Post
After resetting mine last night, the drive to work today was very smooth. Eco mode even shifts faster and doesn't lag so much.
Yeah Eco mode is so much better now after doing the reset. I've noticed no noise/clunk when down shifting that was my main reason for trying this fix. I can actually drive around San Francisco now up and down the hills with out constant shifting it seems to be holding the gear longer when going up hills. Down shifts are a little weird sometimes but I think that's on my end just need to get use to 8 speed trans & Eco mode. The jerk & clunk is gone though Thanks OP I would have never thought of disconnecting the battery to rid a transmission problem.
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  #31  
Old 06-07-2013, 11:07 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

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Originally Posted by geox19 View Post
Yeah Eco mode is so much better now after doing the reset. I've noticed no noise/clunk when down shifting that was my main reason for trying this fix. I can actually drive around San Francisco now up and down the hills with out constant shifting it seems to be holding the gear longer when going up hills. Down shifts are a little weird sometimes but I think that's on my end just need to get use to 8 speed trans & Eco mode. The jerk & clunk is gone though Thanks OP I would have never thought of disconnecting the battery to rid a transmission problem.
Yeah, I guess I meant to say that eco mode is holding gears longer and running the revs up higher so as to not be in 4th gear by 18 mph, LOL. I am no longer almost getting rear-ended and don't need sport mode as often.
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  #32  
Old 06-07-2013, 01:44 PM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

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Originally Posted by vedled View Post
I would almost have to guess that there is some sort of default bank of data in there from the get-go to help with break-in of the transmission or something. Maybe disconnecting the battery clears all of that and allows a full learning process. In my mind, same concept as a default set of MPG data stored which would then affect the Average MPG value that the owner would actually get in the vehicle. Resetting it makes the calculations start from scratch.

Clearly just shooting from the hip here but I can't see the how battery disconnect would cause any issues. Might give it a shot tomorrow since there's already a few thumbs up here from others.
Maybe the transmission is really tight and the initial learning doesn't handle the initial break-in period well. That it, it understands a new transmission, but doesn't adjust quickly enough after it loosen up a bit. In theory, after a while it should settle down. The battery reset permits a new learning process with a smoother transmission (now that it has some millage on it).
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  #33  
Old 06-07-2013, 05:14 PM
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Originally Posted by siegs7 View Post
I tried again with no success. It looks like there is some sort of plug in the center. Does that need to get removed somehow before it will disconnect from the terminal?

Thanks.
If you have a small screwdriver pry the clamp apart a bit, I could not remove until I did this. Be careful.
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  #34  
Old 06-07-2013, 07:38 PM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

Could the harsh downshifting come from the way the vehicle is driven in the factory for the first time off the assembly line? The computer has that first start and drive in it's memory?
By disconnecting the battery you have reset the computer? I worked for Ford for a number of years and at the end of the line when the vehicle was first started the guys would peel out off the end of the line and drive to the rail header. Just a thought. I have about 6K on the clock and I am going to try this fix over the weekend.
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  #35  
Old 06-07-2013, 08:08 PM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

The learning process is supposed to be continuous. If it is still working based on that first shot off the line, the learning process is not working. That is sure a possibility.


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  #36  
Old 06-08-2013, 10:29 AM
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Re: I Think I Fixed My Rough Shifting 8sp Transmission

Wonder if there is a fuse that we can pull to do the same thing. I pull a specific fuse on my 2010 Challenger R/T every once in a while to wake the car up. Throttle response and shift points reset. But like most are saying adaptive learning starts up again and have to do a reset. Guess I'll try the battery reset on the GC unless I can find the right fuse.
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