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Discussion Starter #1
2003 duramax with allison transmission.
situation: start in morning after resting all night. drive out of town at 30 mph for 1/2 mile then up to 55 for the 6-8 miles before the tranny will shift to high gear.
why does it take 6-8 miles before the tranny will shift into the last gear?
If I come to a complete stop at 5-6 miles and then go to 55..it will shift.

Once the shift to high gear is done once...the tranny performs great.

Is there some computer control thing going on?
 

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If it is cold enough the trans will delay shift till it reaches a certain temp. This is supposed to help the engine to warm up I think.
 

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Mine will do that all the time. Takes it a while before it will shift. I have a 2004 with 32K miles. It is normal..
 

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Discussion Starter #4
Thanks!

our dealer couldn't answer what you guys did in 3 minutes.
thanks so I don';t have to worry.
:) :) :) :) :) :) :) :)
 

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our dealer couldn't answer what you guys did in 3 minutes.
thanks so I don';t have to worry.
:) :) :) :) :) :) :) :)
DieselPlace has the most talented and dedicated people I have ever meat. Ask a question and you will get real world answers in short order. Like the golf comercial says; " These Guys Are Good ".:ro) :D
mike
 

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You mean met.....right? cause if you said meat intentionally then....well....nevermind. Censored -:t ):h :grd:
 

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2003 duramax with allison transmission.
situation: start in morning after resting all night. drive out of town at 30 mph for 1/2 mile then up to 55 for the 6-8 miles before the tranny will shift to high gear.
why does it take 6-8 miles before the tranny will shift into the last gear?
If I come to a complete stop at 5-6 miles and then go to 55..it will shift.

Once the shift to high gear is done once...the tranny performs great.

Is there some computer control thing going on?
The tranny is controlled to not shift until the fluid temps reachs 80F...Like 48ford said, its to help warm the engine up quicker since its revs higher...
 

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Mike must have been visiting the sheep shearing site on the Web again.
 
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