I found a 2004 Silverado 2500 that has a bad duramax motor. It has a 6 six manual trans. How much work is it to convert over to a 6.0 gas motor? Also with the manual trans bolt up and work?

 

Not sure if it will bolt in.
Might be as simple as frame side engine mounts from another 2500 or may require welding. trans may work but might need a clutch never messed with one of those.

I am guessing you will Need; Gas tank and filler neck, Fuel lines, Gas cluster, Wiring and computer for Gas motor, Exhaust work.

 

is the 6.0 manual the same as the dmax one? I know autos don't swap unless 8.1. 8.1 may be easier. you could look on the diesel sites and look at the suburbans conversions that where done. it would be basically reverse of that.