I just realized based upon my vin that mine is the HO. What really does this mean over a non HO?

 

You have an 04.5, build date after 1 Jan 04. It has 325/600 hp/tq, electronic wastegate, catalytic converter, different pistons and injectors than the 03-early 04.

 

Not necessarily. HO stands for high output. The HO engines in 03 and early 04 had 305hp and 555 ft-lbs. I don't know for sure what kind of power the standard output engines made in those year models. I think they were like 235hp and 460 ft-lbs or something. In 03 (maybe early 04 too, not sure), you could only get the HO with a 6-speed manual.

If I'm not mistaken, I believe every Cummins engine from 04.5 up is an HO. If yours is an 04.5, it made 325hp and 600 ft-lbs from the factory. The easiest way to tell is to look on side of the valve cover. There should be a sticker there telling you the power output.

 

madhat is correct on the additional parts in the truck. yes every truck from 04.5 is a HO, but they also added those additional parts. it was 325/610 engine.

What that means for you is, if you are looking at installing a tuner or programmer, you have to make sure you pick the proper one. There is a difference in programming from the 04 to 04.5. other then that, mostly everything else hardware wise is compatible in all 2004 trucks.

 

Basically, we are all correct. The 03-04's did have a HO, but if the build date is after 01 Jan 04, it is an 04.5, and all the stuff I said above applies.

 

'03 was the only year with 3 different engines:

235hp was the California Special for their emissions. Because they like being different.

250hp was the Standard Output engine, and was the base engine model if you didn't live in California and didn't order the HO.

305hp was the High Output engine, and was an upgrade option.




Yeah I know, confusing isn't it? I felt the same way when I had my '03.



Kris

 

Count me edumacated! Thanks guys!

 

Just to throw things off from a few posts above lol... It's a build date of 11/03 with 305hp on the sticker on the valve cover and a C on the vin with an auto tranny! Which brings me to my next question, since it's an HO, do I automatically have the 48re? How can I tell?

 

It would have to be a 48RE since it was the only automatic offered, and the 47RE wouldn't be able to handle that much hp/torque.



Kris

 

I'm pretty confident that the 48RE was the only tranny offered in the third gen auto. (until 07.5)

 

The 48RE went into production 01-03 so its definitely that. The 47RE was offered on the SO up to that point.

Both 03 and early 04 had 3 engines,Cali, SO and HO. Early 03 SO's could have a 5 speed or auto with the HO getting the 6 speed.

 

My '03 auto has a HO engine. C code on the vin, and 305 HP 555 TQ on the engine sticker.

 

....and a build date of 01-03 or later. No HO and 47RE was offered.