Hey all,

Simple question, forgive me if it's been answered, but I couldn't find it...

how do you determine if an '04 has an HO motor? (Not sure how to determine a 2004 from a 2004.5 either...)

Thanks!

 

I answered at the "other" site....

 

Look at the mfg date on the door sticker. 4.5 began July 1 2004. The SO engine is 305hp and the HO is 315 hp. You'll find that rating on a sticker on the drivers side of the valve cover.

 

I don't believe that is correct for the SO vs HO engines. I've got an 03 HO with the 48RE and the sticker on the driver's side of the valve cover says 305hp. As far as I know the SO was only available in 03 on the 3rd Gens and it was under 300hp and had the 47RE if it had an automatic transmission.

 

Uhhh, no. That was the start of the 05 models, actually Aug 04 is about the earliest you will ever see a new MY build.

The 04.5 trucks were built starting Jan 04.

On the pre-04.5 trucks HP is listed on the left side of the VC and that determines SO\HO. Higher one is HO of course.

 

"2004" engines
SO: 250/460
HO: 305/555

"2004.5" engine
325/600

 

Simply look at the valve cover on the driver's side. Or look at the build date.

Anything built in late '03 (usually August or later) but before Jan 1, 2004 is an '04. HO is 305/555. SO is 235. I think the SO models that have a stick are 5 speeds while the HO has a 6 speed. I believe the axles are different too, but that might be harder to notice.

Anything built Jan 1, 2004 through about July '04 is an '04.5. HO is 325 HP and it has a cat.

 

Should look like this:

 

Thanks guys... you rock muchly!

Turns out mine is a 2004.5 HO... which makes me extremely happy (especially with the Banks 6 gun on it!)

 

I'm not so sure those numbers up there are correct especially the 235hp

 

I believe that was the hp rating on the SO California compliant engine.

 

235HP is correct for the SO in California, it's what I've got. 5 speed manual.

 

2003 S.O. Federal Emissions: 250HP/460lb.ft. Available with NV4500 or 47RE
2003 S.O. Calif. Emissions: 235HP/460lb.ft. Available with NV4500 or 47RE
2003 H.O. Federal Emissions: 305HP/555lb.ft. Only available with NV5600
2003.5 The 47RE was replaced by the 48RE automatic transmission and available with the H.O.
2004 S.O. Calif. Emissions: 235HP/460lb.ft. Available with NV4500 or 48RE
2004 H.O. Federal Emissions: 305HP/555lb.ft. Available with either NV5600 or 48RE
2004.5 (50 state legal) 325HP/600lb.ft. Available with either the 48RE or NV5600