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GMC 2500 hesitates to enter 4 gear

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  #1  
Old 05-05-2015 | 03:17 PM
DestroyItYourself's Avatar
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Default GMC 2500 hesitates to enter 4 gear
Hi all,

I'm new to my 2003 GMC Yukon XL 2500 and I'm not fully sure if the tranny works as it should. On flat road, I need to exceed approximately 55 Mph before it decides to shift to 4th gear. I have a 496 (8.1Litre), 4L85E and 3:73 diff. I have changed tranny oil and filter, but that didn't change anything.

Is this what I should expect? Or should the tranny be tuned and is it only possible to tune the tranny with a Tech2?

Sven-Erik
 
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  #2  
Old 05-10-2015 | 10:09 PM
GMCSierraFan's Avatar
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Yes... I believe this is normal.

The 4L60 and 4L80e transmissions at least were actually 3spds and the fourth gear was an overdrive.
 
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  #3  
Old 05-11-2015 | 05:14 PM
DestroyItYourself's Avatar
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Thanks for that, really hope youre right.
 
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