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  #1  
Old 08-31-2017, 07:16 PM
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2006 Chevy Silverado 2500HD Duramax/Allison Automatic transmission shifting problems?

I have an '06 Duramax with the Allison tranny it has in the neighborhood of 370,000km on the odometer. Its mostly stock only has 4" exhaust as a mod done by the previous owner. I'm having an intermittent problem where its like the transmission doesn't want to shift from second in to third gear, or third into fourth gear. Also when this happens the engine seems to sound different like a deeper lower bass kind of sound and you don't hear the turbo as much, does the boost from the turbo do anything to shift gears?
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Old 08-31-2017, 08:54 PM
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I had a 04 6.0 gas with kinda the same symptoms. I'm having a brain fart right now and can't remember the name, but the air tube that went into the intake was partially off. Reclamped it and good as new.
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Old 08-31-2017, 09:48 PM
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I had an issue like that on my 03 duramax turned out it was the tuner that screwed up. turned truck back to stock has been 100% has 660000km and 13000hrs and still going strong
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Old 09-01-2017, 12:37 AM
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Ok well I don't have a tuner on it. We disconnected the batteries on it to reset any computer functions. I guess we'll see what happens following that.
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Old 09-01-2017, 09:21 AM
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Call Jeff @ evolution wpg
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Old 09-04-2017, 12:23 AM
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Does ur shift selector light up PRNDL cause i have ran into where they blinking cause neutral saftey switch nfg and they dont shift properly
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Old 09-05-2017, 12:18 AM
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PRNDL works fine.
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Old 09-05-2017, 04:34 PM
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You try manual shift?
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Old 09-06-2017, 01:19 AM
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yup multiple times. Unplugged the batteries recently to let the computers reset.
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Old 09-06-2017, 08:36 AM
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I think time to get it on scanner and see whats goin on in the computer to see if it shows it shifting in the live data
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Old 09-06-2017, 04:59 PM
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So hangs on upshift & revs or hangs on downshift & kinda bogs?
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Old 09-06-2017, 05:04 PM
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Have you changed tires lately or towed heavy trailer? Trans could be in relearn mode
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2500hd, automatic, chevy, duramax or allison, problems, shifting, silverado, transmission


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