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The 2003 2500 does not have cv joints they use u joints and it sounds like you may have a gear rattle from the transfer case when engaged in four wheel drive.

I had the same problem with my 03 and it turned out to be the crank sensor.It never showed any code./

Can you please explain what you mean by udc tune.; I hope I;m not coming across as a idiot I am a retired mechanic and before i put the 06 cummins in the truck i did some checking and was told i would have no problems with the switch if i 'd known i was going to have these problems i would...

As i mentioned before the ecm and all the sensors are off the 2003 engine.So other than the dished pistons and 06 injectors engine should be the same as the 03.So by changing the injectors to 03 style it should preform like a ho high output 305.

I had a bulldog programmer on the 03 and truck was getting great fuel millage but when i tried to use it on the o6 it blows black smoke regardless of what setting it is on.This tells me the injectors are over fueling, Other than the pistons and injectors what is the differance between the 03 and...

I'm a little confused your saying not to change the injectors yet the 03 injectors will work and may increase fuel milage

replaced 2003 ho cummins with a 2006 cummins. Fuel mileage went from 22 miles per gallon to 18 miles per gallon.Dealer claims the injectors need to be changed to injecters from 2003' The fuel injection shop says that the ecm controls the amount of fuel the engine requires and it was from the...