I just purchased a 2003 3500 Quad Cab Shortbed and am trying to figure out what motor I have. I searched the site and even looked on the Cummins website but I couldn't seem to find what I was looking for. I know its a 24V, but how do I determine whether its a HO motor or not? What are the stock HP & Torque ratings on this motor? I have the 6-speed tranny (which tranny is this?), if that matters. Thanks for the help and sorry if my questions are repetitive.

 

I'm no 3rd gen expert but a stab at it would be 300/555
Your post would probably get more exposure in the 3rd gen catagory.
I think the trans is a NV5600 (not a standard expert either )

 

give me your serial numbers off the engine and I can tell you everything you need to know.

 

Thanks. I'm at work now but I'll pull them tonight when I get a chance

 

You have a 305hp./ 555 trq. HO. the 6 spd only came with the HO. if you look on the driver's side of the black plastic valve cover you should find the emissions certifications sticker that will verify what I just told you. It isn't a california spec truck either(no HO's in california for '03)

 

Thanks for clearing that up for me. Appreciate y'alls help!

 

 

And your trans is an NV 5600. Reverse is over and up (next to 5th)