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Go Back   Dodge Cummins Diesel Forum > 3rd Gen. Dodge Cummins 03-07 Common Rail Forums > 2003/2004 General Discussion
2003/2004 General Discussion General Discussion for the Early (2003/2004) Common Rail No Advertising ...NO ADVERTISING

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Old 06-19-2011, 09:52 PM   #1 (permalink)
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SO vs HO

What is the difference in the 03 SO vs the HO? Is it an easy 'upgrade' with just OEM parts or is it a impossible/unrealistic dream? I figure if its' just swappin parts - I'm guessing maybe the cam, computer, not sure what else. If I start off with more OEM power the after market stuff should make more of a difference.
Anyone done this or is it a lost cause?
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Old 06-19-2011, 10:00 PM   #2 (permalink)
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i know on the 24 valve Cummins w/ the vp44 injection pump that the only major difference is the injection pump itself between the so and ho's...but there are also some different internal things too

but as for the 03/04's, i have no idea...but either way you may as well try and find a 305/555 truck man
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Old 06-20-2011, 02:18 AM   #3 (permalink)
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No, starting with an HO will not equate to more power modded over an SO. Pretty much everything is the same. There's a few differences, I can't remember them all, but mostly a different tune. The turbo is the same, the CP3 is the same, cam is the same...

A programmer on each will be roughly the same power
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Old 06-20-2011, 03:17 AM   #4 (permalink)
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Originally Posted by 'strokeThis_'07 View Post
No, starting with an HO will not equate to more power modded over an SO. Pretty much everything is the same. There's a few differences, I can't remember them all, but mostly a different tune. The turbo is the same, the CP3 is the same, cam is the same...

A programmer on each will be roughly the same power
For the common rails thought the 03-04s were the "so's" and the 4.5's were the "ho's". Also if that is what he is asking the difference between arnt the turbos differnt. I thought the "so's" had a 57mm and the "HO's" had a 60mm only reason i know that is because i wanted a 3rd en turbo on my 2nd gen. Isnt it a he351 right?
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Old 06-20-2011, 04:28 AM   #5 (permalink)
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For the common rails thought the 03-04s were the "so's" and the 4.5's were the "ho's". Also if that is what he is asking the difference between arnt the turbos differnt. I thought the "so's" had a 57mm and the "HO's" had a 60mm only reason i know that is because i wanted a 3rd en turbo on my 2nd gen. Isnt it a he351 right?
03-04 had SO and HO. 04.5+ were all HO I.guess you could say.

Turbo:
03-04 was HE341
04+5 was HE351

03-04 HP
SO = 285?
SO California= 235
HO= 305

04.5 = 325
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Old 07-11-2011, 09:47 PM   #6 (permalink)
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So say you put a Predator programmer on a SO (255hp), and the same tune on a HO(325hp) would they dyno about the same? or would it add say 60hp to the 255 making it 315hp? And adding 60hp to the HO making it 385? Im just confused on how putting the same tune would make them both equal, when one started with 50hp less in the beggining.
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Old 07-12-2011, 09:47 AM   #7 (permalink)
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The 03 SO is 250 hp. I think the main differences are computer programming, and the HO's have piston cooling jets that the SO's don't have.
Not sure about the predator, but the Smarty will equal the engines to an HO--so I was told. The #'s in my sig show that to me.

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Old 07-12-2011, 09:52 AM   #8 (permalink)
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Originally Posted by Texas 24 valve View Post
For the common rails thought the 03-04s were the "so's" and the 4.5's were the "ho's". Also if that is what he is asking the difference between arnt the turbos differnt. I thought the "so's" had a 57mm and the "HO's" had a 60mm only reason i know that is because i wanted a 3rd en turbo on my 2nd gen. Isnt it a he351 right?
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
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Old 07-12-2011, 09:57 AM   #9 (permalink)
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the only difference is the piston squirters... the 235hp California and 250hp SO Federal engines use the 89-02 style piston squirters.

the 305hp 03/04 HO engines use the metal j-hook style squirters with corresponding reliefs cut in the skirts of the pistons.

that's it... that's the extent of the differences as far as the engine is concerned.

non HO trucks also got the NV4500 vs. the NV5600 and 03 automatics got the 47RE vs. the 48RE

If you were to use a plug-in module like the TST or Banks that fool the ECM, then you will make more power starting with an HO engine.

If you are adding a programmer, it will load the same tune no matter if the truck is an SO or an HO.

If you're anywhere near Houston TX I can flash your non-HO into an HO and it will remain an HO even if you return it to stock with a programmer.
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Old 07-12-2011, 10:07 AM   #10 (permalink)
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non HO trucks also got the NV4500 vs. the NV5600 and 03 automatics got the 47RE vs. the 48RE
Depends on the build date. Any 03 SO built in the calendar year 2003 also had the 48RE.
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Old 07-12-2011, 10:46 AM   #11 (permalink)
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which would be an 03.5
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Old 07-12-2011, 01:56 PM   #12 (permalink)
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Show me ANYWHERE that they actually call it an 03.5. WE call it that but Chrysler does NOT.

And for the record since you want to go that way the HO in 03 NEVER got the 48 either since the 48RE wasn't even out. The 03 HO's only came in manual.
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