M939 That Whistles Like a Deuce?

[ClassicTVMan1981X]

For all those of you who own an M939 series truck, have you ever tried doing anything to make it whistle like a Deuce?

For Cummins diesel engines, that should be easy. But, what I am curious about is whether or not the intent to make it whistle as loud as a Deuce may strain the Allison MT654CR transmission?

~Ben

 

[tim410]

That would be awesome.

 

[Suprman]

You could hook up one of those fake blowoff valves so you get a big whoosh when you let off the gas too.

 

[wheelspinner]

Mine is straight piped and does just that. Its LOUD (Yes!) and has the off throttle whoosh....

 

[doghead]

The Allison trans can't take the whistle(neither can I).