[Mickey_Cali_661]

The truck is new to me. From what am told and the way it runs it has a programmer. It also has a big head wastegate and gears. The Truck can boost between 30 & 35psi. My problem Is if I lay into the throttle at about 70mph the truck will take off like a bat out of hell, but than when it hits around 80/90 it jerks real bad than and loses 5th gear. It don't lose power or throw black smoke. It just loses 5th gear. It doesn't even throw a check engine light.

So does that mean my tranny is going into limp mode? If so, how do I fix it?

The tranny has an ATS torque converter from what am told (its purple). If it was a gas engine and tranny I would say it had a shift kit, but since am new to diesel and allisons I dunno...

So what do u guys think?

 

[cuse diesel]

fill out your sig so we know what you have

 

[Mickey_Cali_661]

Ok... don't know much about the truck though...

 

[.DmaxLb7.]

could possibly be losing fuel. many trucks will cut out around there if no lift pump is on the truck

 

[Mickey_Cali_661]

But wouldn't it do it everytime if it was the pump? Or am I mistaken? It only did that twice... gots me scared that it might be my tranny.

 

[.DmaxLb7.]

If the user is pushing a 480 hp and up tune roughly, he will cut out of fuel. Im guessing he is since he has a ATS convertor, and yes it will everytime

 

[Mickey_Cali_661]

It doesn't do it everytime... but that would make my gear drop and stay there? How do I have that checked, if so...

 

[.DmaxLb7.]

i dont know about that, but i have rode in a few when it lost fuel, its like hitting a rev limiter. maybe someone else will chime in

 

[Mickey_Cali_661]

That's what it feels like. Than it red lines and pops into 4th. I have to kill the engine to get 5th back. Thanks...

 

[diesnuts]

well if you are dropping gears i wouldnt think thats a fuel issue..sounds like you are limping it, but no check engine?? hmmm

 

[Mickey_Cali_661]

No check engine light.... gots me baffeled...

 

[d-max19]

my stock allison cant even hold up to a quadzilla programmer

 

[Mickey_Cali_661]

Oh wow... I don't know what stock feels like. I got this thing like this... lol