Looks like a cruise control, but what is it?

[Guruman]

What is this module just above my fuel filter and pump? It has some wires, and a cable connecting to the throttle linkage. It looks to me a lot like the cruise module for a 3126 or C7... but I have an A0.

What is it?

 

[coachgeo]

is there a winch on the truck?

 

[Guruman]

is there a winch on the truck?

Not yet. It's sitting in a crate in the bed. Also, the high idle for winching is manual on the A0 trucks, right?

 

[coachgeo]

....Also, the high idle for winching is manual on the A0 trucks, right?

In a normal world....... yes.

 

[Guruman]

Ah. Mystery solved. It's a throttle position sensor for the trans.

 

[Ronmar]

Yep Allison TPS, very necessary for the TCU to predict shift points and shift smoothly. Out of cal or failed/disconnected and the trans shifts by minimum and maximum RPM which can be kind of harsh