i own a 2004 5.9 and i think i blew a ring, the truck still runs and drives perfect. my buddy said it should be a 5k repair is this true?

 

How did you come to that conclusion?
What are your symptoms, what's going on to make you think it's a blown ring?
Tell us more so we can help more.

 

to just replace on ring should be less than 400 in parts that is if no cylinder wall damage. I lost a piston a few months back. I replaced the piston had alll decompressed and recoated,custom cam and springs. and had less than 2500 in everything.

 

dark smoke coming from the tube under the motor and its also burning the oil out

 

Hmmm, no way to tell. It sounds like an injector or something. Only way to know is tear into it. What you are saying dosen't make sense. If you are burning oil it normally comes out the tail pipe. Any blue smoke out the tail pipe? It will smoke out the vent tube, after working it hard, a little. Only way I can think of that will cause it to smoke out the vent tube is excess crankcase pressure and that is caused by a scored block, bad piston,or bad rings. Not the oil ring.

 

from the moment i turn it on the smoke never stops. and if the oil cap is removed it would smoke from there too.

 

I am curious?