I have noticed that there have been a few questions about a H.O. engine. I just purchased a 05 3500 and now I wonder which engine I have, are there 2 different engines and if so how do you tell them apart.

Thanks in advance

 

2005 Engines are all HO in all 50 states...

 

Well I'll give you what I know about HO/SO.

Dodge/Cummins in early 2004 released the 325/600HO(High Output) Cummins in the 2500/3500 Ram trucks(These commonly referred to as 2004.5). This was to be able to sell one diesel engine configuration in all 50 states and meet EPA/Emission requirements.

Before this there were a number of different Cummins configurations SO(Standard Output), HO(High Output), California verisions with Catalytic Converters, I think there were a couple other areas that also required specific configurations to meet local Emission Regulations. They had different HP and Torque specs along with area specific equipment and programming.

I believe that since the 2004.5 release that all are normally HO engines. Yours should be a 325/610 HO Cummins. Should say on the Window Sticker or truck invoice sheet.

 

Limiting this discussion to the Common Rail engines only:

2003 S.O. Federal Emissions: 250HP/460lb.ft. Available with NV4500 or 47RE
2003 S.O. CA Emissions: 235HP/460lb.ft. Available with NV4500 or 47RE
2003 H.O. Federal Emissions: 305HP/555lb.ft. Initially only available with NV5600
2003.5 HO Federal Emissions: 305HP/555lb.ft. Available with either NV5600 or 48RE

2004 mirrored the 2003 options, except the 47RE was replaced with the 48RE in all combinations

2004.5 introduced the Cummins 600 engine, which carried 50-state emissions. It was rated at 325HP/600lb.ft., and was available with either the 48RE or the NV5600

2005 brought the 610 engine into being, with 325HP/610lb.ft. Also 50-state legal.

2005.5 (as of January) saw the NV5600 replaced with the G56 6spd manual gearbox.

 

don't forget that in 2003 the 48RE was available to the SO (250/460) engine as of Jan 1, 2003
this is what i have...

 

And I have 2003 with the 48RE in the SO (235/460).

 

Right - sorry about that... the 48RE replaced the 47RE in the '03.5 model year - shortly after the 48RE became available

 

Thanks for all the replies