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2015 GMC 3500HD transmission failure 1st to 2nd. Hard shift

Holdenj1

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Holdenj1 Enthusiast

Holdenj1

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So my 2015 gmc 3500 has this crazy hard shift from 1st to 2nd gear and 2nd to 1st. I heard it's from this.

 

Truck is a diesel with Allison all options

 

 

http://www.gm-trucks...ft-in-2nd-gear/

 

Truck has 7k on it. All highway. And never seen rain.

 

Dealership says it's normal...

 

how do I make them take my tranny out and actually fix it like this dealership in the link I posted.

 

 

Dealership is Casa De Cadillac in socal CA VAN NUYS/ Sherman Oaks CA

 

Truck hasn't seen rain or cold weather period...

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