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I am new to this site and kind of have a basic question but haven't been able to find the answer on here yet. What is the difference between the 5.9HO motors and non HO motors. Just a different program from dodge or? I have a 2003 cummins with an automatic that i recently bought and I am a little worried on what I can do to the motor to make more power without hurting the stock transmission. Any advice would be appreciated!
Any easy way to find out which one you have is look at the valve cover and it will tell you how much advertised hp you got
235 = California
250 = SO
305 = HO
As far as trans you could have either a 48re or a 47re. The 48re took over for the 47re in late 2003. If a truck is driven too hard stock you can destroy a stock trans but you really got to beat on it. The 47re have the rep of being a weaker trans than the 48re. The 48re is stronger than most people give it credit for, I have had my truck modded for 30k of the 33k miles I have owned it. The 147k mile old trans can handle the level one of Smarty TNT (100 hp) surprisingly well. But I try not to push my luck. A stock trans can handle 60-90 extra hp fairly reliably but no 4wd and/or boosted launches.
As far as what separates a HO from a SO or Cali motor, the biggest difference is programing. There are some other differences but the biggest is programming.
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