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Discussion Starter · #1 ·
I have a 04 GMC Sierra LB7 and when i get on it, around about 45 MPH it stops accelerating and doesn't shift from 3rd to 4th after awhileit feels like somthing drops and then takes off again.. Don't know what the problem is?
i need help!
 

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i had the same problem on my 06 2500HD so i took it back to the dealer and had them upgrade the tranny computer and it took care of the problem but for extra safety measure i had a bully dog shift kit put in,runs like a new truck
 

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I have a 04 GMC Sierra LB7 and when i get on it, around about 45 MPH it stops accelerating and doesn't shift from 3rd to 4th after awhileit feels like somthing drops and then takes off again.. Don't know what the problem is?
i need help!

When is the last time you changed your fuel filter? Change it first and then see what happens.
 
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