I have a 2002 2500 silverado duramax and it makes a ticking noise only when I step on the gas.

blue smoe is the sign of burning oli. it ban be rings or valve seals

Harmonic balancer.

There is only one owners manual for the truck. The Trucks with the Duramax came with a Duramax Diesel Supplement Book. This is what you want.

YOUR ELECTRIC FUEL PUMP IS THE DIESEL INJECTION PUMP.

WORN PISTON RINGS MAKE A TICKING NOISE.VALVE LIFTERS MAKE TICKING NOISE.WORN DISTRIBUTOR SHAFT BUSHINGS MAKE A TICKING LIKE NOISE.

I bought a used 05 Silverado and it had started to get a ticking noise. I had one of the lifters replaced as it was determined that it was sticking. A week later the oil pump went. Replaced the pump and have not had any issues since.

from the description you give, this sounds like the engine is "pinging". the way to solve this is to use a higher octane gas, or change to a hotter spark plug.

This may not be your problem, but recently we had chevy in with a ticking on acceleration that turned out to be a leak on the right hand exhaust manifold only slight but enough to make a noise when driven hard. we noticed a carbon mark around the second cylinder in. If it is a petrol engine have you checked the spark plugs are correctly torqued?

This sure sounds like a U joint, check them all again.

I kind of had the same problem with my car, the dealer kept saying it was nothing wrong with the vehicle and that the ticking noise would fix itself electronically. Wrong, it was my valves needed adjustment and that ticking noise was never going to be fixed electronically.