2010 auto slow to shift - Dodge Cummins Diesel Forum
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post #1 of 12 (permalink) Old 12-09-2010, 06:48 AM Thread Starter
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2010 auto slow to shift

My 2010 auto 3500 is slow to shift into 6th gear when the transmission is cold. I have to drive afew miles before it upshifts into 6th. Once warmed up it shifts into 6th normally. Only 2300 miles on the truck. Any ideas?

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post #2 of 12 (permalink) Old 12-09-2010, 07:06 AM
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it is totally normal......don't worry about a thing!

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post #3 of 12 (permalink) Old 12-09-2010, 07:19 AM
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You don't indicate where you are or what the temps have been.

I run the Edge Juice for guages and my tranny will not go into 6th or lock up until the tranny temps get above 60F which has been taking almost 10 miles of driving with the recent morning temps at 15F here in Charlotte.

In summer it is in 6th by the end of the driveway.

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post #4 of 12 (permalink) Old 12-09-2010, 08:33 AM
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it is totally normal......don't worry about a thing!

2017 Dodge Ram 2500 Quad Cab 4X4, 6.7L, 68RFE, Amp Running Boards, 15K miles and counting...
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post #5 of 12 (permalink) Old 12-10-2010, 08:05 AM
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Yes, the 5-6 shift will not occur until the torque converter clutch (TCC) has engaged. But the TCC will not engage until the trans sump temp has risen to a certain temperature (this used to be 80F, but per PJesson's note, maybe they've changed this to 60F now). Anyway, once the TCC is allowed to engage, then the trans will also make the 5-6 upshift.

So as noted, when cold, no 5-6 upshift is normal.
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post #6 of 12 (permalink) Old 12-10-2010, 11:04 AM
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Yes, the 5-6 shift will not occur until the torque converter clutch (TCC) has engaged. But the TCC will not engage until the trans sump temp has risen to a certain temperature (this used to be 80F, but per PJesson's note, maybe they've changed this to 60F now). Anyway, once the TCC is allowed to engage, then the trans will also make the 5-6 upshift.

So as noted, when cold, no 5-6 upshift is normal.
I can't guarantee the exact temps when it starts to shift. That was a somewhat anecdotal observation. But I'm pretty sure it is less than 80 because the tranny is barely up to 80 by the end of my morning commute these days and it usually starts finding 6th by about half way in.

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post #7 of 12 (permalink) Old 12-10-2010, 12:07 PM
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I checked the exact number in the calibration. TCC engagement is inhibited until the trans sump temp reaches 55F.
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post #8 of 12 (permalink) Old 12-10-2010, 11:41 PM Thread Starter
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Thanks for all the replies and info. I've been watching temps and it has been constantly shifting into 6th once it reaches 57 degrees.

Out of curiousity, whats the purpose of the tranny not letting itselfs shift until its at that temperature?
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post #9 of 12 (permalink) Old 12-13-2010, 07:39 AM
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Out of curiousity, whats the purpose of the tranny not letting itselfs shift until its at that temperature?
I'm not positive, but I think the concern is possible shudder / NVH issues if the TCC is allowed to engage at lower temperatures.
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post #10 of 12 (permalink) Old 12-13-2010, 07:41 AM
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Also allows the truck to warm up faster due to higher rev's.

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post #11 of 12 (permalink) Old 12-13-2010, 08:00 AM
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Also allows the truck to warm up faster due to higher rev's.
YES, very true. It actually warms the TRANS up much faster due to the heat generated in the converter when running with the TCC unlocked.
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post #12 of 12 (permalink) Old 12-13-2010, 08:21 AM
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Thats what I was told at the R&D center many years ago when I complained about my 98 not wanting to shift into OD until it was warm.

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