Allison Issue

[Shawn T]

Had to stomp on it last week to merge into traffic and it fell right on it's face. Had to back off of the throttle to get going. I have always noticed when I accelerate hard, it shifts funky. What gives? It has had these symptoms for years. I have went through fuel filters, no affect. No lights, codes etc.

[gmtech4]

not the tranny IMO

 

IDK what to tell ya ,

 

no input =no output

 

turbo ? waste gate ? exh? fuel delivery?

 

good luck, take it in

 

anyone else ?

[Shawn T]

That is just the problem, I have taken it in. 4 times. They have thrown every part in the book at it. 2 injectors, fuel pressure regulator, some other vavle bank on the fitler itself. The way it shifts (doesn't upshift) makes me suspect the tranny.