Delayed Shift on LML - Chevy and GMC Duramax Diesel Forum

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post #1 of 4 (permalink) Old 09-03-2013, 02:28 PM Thread Starter
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Delayed Shift on LML

So I have 25k miles on the truck, and it's only been tuned for about 3,000. Today I noticed when I started the truck up and was trying to pull out of a parking space, it was taking several seconds for it to shift from reverse to drive. I played with it a little in the parking lot, and it did it consistently. Once I got home, I tried it again and it was fine. What I am worried about is, I had a car that did something similar, slipped until the fluid built up, then ran ok, but the tranny then went out not long after.

I am REALLY worried that there is something wrong and I JUST tuned the damn thing, so I find it hard to believe that it was a tuning issue, but you know they automatically void the warranty (even though that's a federal law that they can't auto void it).

Any suggestions, thoughts or advice?

2011 2500 GMC Denali
H&S XRT Pro Tuner
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post #2 of 4 (permalink) Old 09-03-2013, 03:07 PM
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Don't base previous car auto experiences on anything the Allison does....or doesn't. It's unlike any car trans.

Note: You can move the shifter up top, but you're just 'requesting' a command. It's up to the TCM as to when or if your request is followed thru on. It consistently learns and makes changes depending on how you drive, what you tow, changes in tuning, wear of parts, etc.

It was probably nothing, just a bit of confusion to work out. I wouldn't worry about it unless it keeps returning.

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post #3 of 4 (permalink) Old 09-03-2013, 03:18 PM Thread Starter
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Quote:
Originally Posted by Hook'em_Horns! View Post
Don't base previous car auto experiences on anything the Allison does....or doesn't. It's unlike any car trans.

Note: You can move the shifter up top, but you're just 'requesting' a command. It's up to the TCM as to when or if your request is followed thru on. It consistently learns and makes changes depending on how you drive, what you tow, changes in tuning, wear of parts, etc.

It was probably nothing, just a bit of confusion to work out. I wouldn't worry about it unless it keeps returning.
Thanks! That's a big relief. I will keep in mind that the Allison might act differently from time to time.

2011 2500 GMC Denali
H&S XRT Pro Tuner
DPF delete
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post #4 of 4 (permalink) Old 09-03-2013, 03:24 PM
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