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Discussion Starter · #1 ·
well im not looking to buy anything right this moment but i have decided i want to buy a common rail. i have a few questions though. i have heard they are not all the same. what is the differance in them through the years.
also what ever i do end up getting will be crew cab short bed 4x4 6spd
what is the best years for those trucks? is the any difference in them?
 

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As far as 3rd gens go there are two different drivetrains to the same truck. The pre 2004.5 are pretty good and the 2004.5 and later aren't that bad. For more details try the "search" button.
 

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vvv SOME PEOPLE'S KIDS vvv
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03-04 trucks are 305/555 rated and have a 2 pulse injection system with 8 holes on the tip of the injector nozzle. 04.5 trucks are 325/600 with a 3 pulse injection sytem and have 5 holes on the tip of the injector nozzle. Early trucks can get away with larger nozzles and can make some serious HP vs the 04.5's and not have to worry about melting the motor. It's gonna be hard to find an 03-04 6spd with decent miles at a good price.
 

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03-04 trucks are 305/555 rated and have a 2 pulse injection system with 8 holes on the tip of the injector nozzle. 04.5 trucks are 325/600 with a 3 pulse injection sytem and have 5 holes on the tip of the injector nozzle. Early trucks can get away with larger nozzles and can make some serious HP vs the 04.5's and not have to worry about melting the motor. It's gonna be hard to find an 03-04 6spd with decent miles at a good price.
Actually there are a few flavors of Cummins from 03-05:

03
CA 235/460 nv4500 trans or 47re
SO 250/460 "
HO 305/555 nv5600 only.

03.5
48re an option behind all motors.

04
SO 250/460 nv4500 or 48re
HO 305/555 "

04.5
All states 325/600 nv5600 or 48re

05+
325/610 nv5600/G56 or 48re

The 03-04 trucks seem to get better mileage the 04.5+ trucks make more power. Like mentioned above if you go too far with the power without adequate air flow then you can melt down the truck. The air flow to cylinder 5 and 6 leaves a lot to be desired.
 

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04 also has a cali 235/460 version with a 48re. i'm one. smarty takes care of that measily factory program.

03-04's only have 2 stage injection with a better piston bowl design. 04.5-07 have 3 stages of injection (a little quieter) and the piston bowl designs make it easier to melt pistons if the spray angle of the injectors change too much/too much timing. 04.5-07 will make a little more power with just a programmer and also come with the he351cw turbo. the 03-04 respond better to injectors beyond programming, but have a small factory turbo he341 (basically an hy35) that limits power.

no-cali 03-04's do not have a catalytic converter either
 

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Discussion Starter · #6 ·
on the 03-04 some have 250 hp and some have 305, are they both the same and not like tuned to have 305 or are the ones with 250 just have smaller injectors and that type of stuff?
 

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Discussion Starter · #7 ·
also i wont buy a auto cummins. ive heard alot of bad and little good bout them and with my luck id be in the bad catagory so im just gonna get a 6 spd. ive always had a standard so might as well stick with it
 

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Discussion Starter · #9 ·
btw i dont plan to put down 1000 hp. mainly intake exhaust gauges chip or two and posibly injectors and a turbo. that would probably be the most that gets done to it
 

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04 also has a cali 235/460 version with a 48re. i'm one. smarty takes care of that measily factory program.
yes I goofed..sorry I believe there were no SOs in 04 it was HO or CA IIRC

on the 03-04 some have 250 hp and some have 305, are they both the same and not like tuned to have 305 or are the ones with 250 just have smaller injectors and that type of stuff?
IIRC it is just programing

also i wont buy a auto cummins. ive heard alot of bad and little good bout them and with my luck id be in the bad catagory so im just gonna get a 6 spd. ive always had a standard so might as well stick with it
The 48re is not as bad as everyone makes it out to be. Be smart don't beat the crap out of it and it will run fine.

btw i dont plan to put down 1000 hp. mainly intake exhaust gauges chip or two and posibly injectors and a turbo. that would probably be the most that gets done to it
You will want to throw a clutch, fuel system, head studs and valve springs in there while you are at it. :thumbsup:
 

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I thought the so and ho had a different cp3
 

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Your probaly right i just thought id read on here that the so flowed more volume and the ho used higher pressure. but like i said i just read that one here im still learing.
 

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vvv SOME PEOPLE'S KIDS vvv
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yea I was at work running a CMM program and couldn't go into so much detail about it but yea that's pretty much the differences. Oh and the 03-04 had an HE341 57/60/9 with a 3.5" down pipe and exhaust. While the 04.5+ had the HE351 60/60/9 with a 4" down pipe and exhaust. One of the best upgrades to do to these trucks is put a 2nd gen exhaust manifold on it to keep the pressure off the 5&6 cylinders. Of course you'd have to fab up alot of parts to fit but it helps spoolup and gives you that nice little exhaust sound that the 2nd gens have.

Actually there are a few flavors of Cummins from 03-05:

03
CA 235/460 nv4500 trans or 47re
SO 250/460 "
HO 305/555 nv5600 only.

03.5
48re an option behind all motors.

04
SO 250/460 nv4500 or 48re
HO 305/555 "

04.5
All states 325/600 nv5600 or 48re

05+
325/610 nv5600/G56 or 48re

The 03-04 trucks seem to get better mileage the 04.5+ trucks make more power. Like mentioned above if you go too far with the power without adequate air flow then you can melt down the truck. The air flow to cylinder 5 and 6 leaves a lot to be desired.
 

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vvv SOME PEOPLE'S KIDS vvv
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yea I was at work running a CMM program and couldn't go into so much detail about it but yea that's pretty much the differences. Oh and the 03-04 had an HE341 57/60/9 with a 3.5" down pipe and exhaust. While the 04.5+ had the HE351 60/60/9 with a 4" down pipe and exhaust. One of the best upgrades to do to these trucks is put a 2nd gen exhaust manifold on it to keep the pressure off the 5&6 cylinders. Of course you'd have to fab up alot of parts to fit but it helps spoolup and gives you that nice little exhaust sound that the 2nd gens have.

Actually there are a few flavors of Cummins from 03-05:

03
CA 235/460 nv4500 trans or 47re
SO 250/460 "
HO 305/555 nv5600 only.

03.5
48re an option behind all motors.

04
SO 250/460 nv4500 or 48re
HO 305/555 "

04.5
All states 325/600 nv5600 or 48re

05+
325/610 nv5600/G56 or 48re

The 03-04 trucks seem to get better mileage the 04.5+ trucks make more power. Like mentioned above if you go too far with the power without adequate air flow then you can melt down the truck. The air flow to cylinder 5 and 6 leaves a lot to be desired.
 

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will an aftermarket exhaust manifold help solve the cylinder heat problems. My stock one is cracked so i have to replace it anyway. i was thinking about the BD or the AFE
 

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will an aftermarket exhaust manifold help solve the cylinder heat problems. My stock one is cracked so i have to replace it anyway. i was thinking about the BD or the AFE
It will help but not solve :banghead:
 
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