hello,
My truck is a 2004.5 i think because i have a cat on it an the electric waste gate, but i thought they put the 325 hp motor is these trucks the sticker on the side of the block says 235hp at 2700 rpm the modle number is isb 235 just tryin to figure out what i have.

 

so if they put the 325 in some of these trucks mine should be good for another 100 horse right what the difference? My truck is advertised as a High Output 5.9 liter cummins turbo diesel
thanks dennis

 

If it is the 235 model it's not an HO, it will likley also have a 47re which may require attention before you throw much power at it.

 

It sounds like you have an early 04 California model SO truck. If it was built after 1-1-04...you have an 04.5 truck.

 

Here is a break down of the motors and trannys based on year:

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

2005.5 The NV5600 replaced with the G56 6spd manual gearbox.

 

the motor was mfg on 10-6-03 so what do i have? it has a cat on it and it also has the electronic waste gate. If its 235 Hp then i could put 100 hp to it make it a "HO" without any problems right? Or would i need to change/Mod something?

 

Yes, just be careful how you MOD. You want to be aware of your EGTs, and not burn up the 48RE. Gauges and a Smarty would be my recommendation (or a mild box with timing).

The famous 235hp Cali trucks do have a cat and were mandatory in 5 states including California and New York in 03 and early 04.

 

ok i plan on puttin a 60-80 hp chip i live in mew york so thats way i have the cat on it my question is can i put this chip in and be safe i have an air intake on it an no muffler. Also i do have the 48re or the 47re? thanks for all your help dennis

 

You have the 48re.

I find that the SOs seem to run cooler than what others report with their HOs. That being said, You still will want an EGT gauge at the least. I run a Quadzilla box on 65 hp without heat issues. It does throw a code on occasion though. I will be looking into the smarty next.