Diffrence between the 2003/2004 and the 2004.5/2005

[inh0001]

I see alot of products being sold for the Cummins diesel that fit either the 2003/2004 or the 2004.5/2007 trucks! WHAT is the big difference between 2004 and the 2004.5 trucks??? I have a 2004 cummins diesel that manufactured in the month of May/2004...

[inh0001]

What I meant to say specifically is that the exhaust systems seems to be different in the 2004 cummins trucks!(ebay after market exhausts and Pac brakes)

[BBRam]

03 did not have the Cat. and had a 3.5'' downpipe, not sure about 04. 04.5 up I believe had the Cat. and a 4'' downpipe.

[ynots57]

The 03 is the same hp as 2004. Correct, In 2004.5 they added a 4” turbo back exhaust w/cat

[1JP]

HP & Torque, no? And the change in auto trannies?

[ynots57]

Originally Posted by 1JP

HP & Torque, no? And the change in auto trannies?

05 they went from the 47re to the 48re tranny.
Other changes: 325hp
• Air inlet redesigned to block hot engine air from entering, reducing the intake charge by 30 to 40 degrees.
• Intake resonator re-engineered for increased airflow
• Larger compressor on Holset turbocharger
• Engine cooling improved with new fan assembly and mounting fan shroud to engine for more efficient airflow through radiator
• Upgraded intercooler
• Upgraded exhaust valves
• Tailpipe increased to 4-inch diameter
• Improved sealing and gasket materials
• Oil-change intervals are now 15,000 miles (vs. 7,500 for competition).
• Holset turbocharger gets bigger compression side
• Switch to electronic control of wastegate
• Upgrades to exhaust manifold
• Revised intake ports in cylinder head
• New piston bowl geometry
• Different spray pattern from injectors

[rufushusky]

I think the 47re went away about half way through 2003. I have a 2004.5 and I have a 48re.

03-04
CA trucks: 235/460
SO trucks: 250/460
HO trucks: 305/555

04.5-05
04.5: 325/600
05: 325/610

[Ram3500Dually]

Man, some of you guys are off.
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

2005 (50 state legal) 325HP/610lb.ft. Available with either the 48RE or NV5600

Your 04 built in the month of May is an 04.5. The 04 had no cat, the cat itself came on the 05. That is the reason they upped the torque to 610 from the 600 in the 04.5's. The 305's had 3 1/2 inche exhaust. The 325's had 4 inch

[knifeman]

I have a 04.5 325/600 with a cat, well not anymore but it came with one from factory.

[ynots57]

Originally Posted by rufushusky

I think the 47re went away about half way through 2003. I have a 2004.5 and I have a 48re.

03-04
CA trucks: 235/460
SO trucks: 250/460
HO trucks: 305/555

04.5-05
04.5: 325/600
05: 325/610

Ok, thanks for info. I shouldnt have said in 05 they went from the 47re to the 48re tranny. 2004.5 and 2005 are same trucks

[Ram3500Dually]

Originally Posted by knifeman

I have a 04.5 325/600 with a cat, well not anymore but it came with one from factory.

I have heard that some came with cats but I hadn't seen one.

[white ramhead]

mine has a cat also