I have a 2002 Silverado. At idle the truck ticks and when accelerating it seems to tick too but faster. The sound is louder under the truck and under the hood. Could this be and exhaust leak?

The ticking noise could be coming from a CV joint. Does the ticking noise go away in reverse? A loose brake pad (Anti rattle clip missing or broken) will move back and forth in it's mounting, a warped rotor will enhance this effect, the ticking noise will come when the pads moves upward into it's mounting causing a metal on metal tick.
Does the ticking noise get louder when you are turning the vehicle? If it does this would indicate a worn CV joint.

its ya lifters. not getting enough oil to motor. oil pump prob goin out or you spun a crank bearing

sometimes pieces from inside your catalitic converter break loose and make a ticking noise and would be hard to spot without the engine running

You have a lifter Ticking. You need to have it fixed quick, it could ruin your cam, anong other things.

On a high mileage engine you should use 10w 30 NORMAL oil not synthetic.

Check the Alternator / Powersteering belts .
One of them will be damaged and loose.
Hope this helps.

have it checked out. it may be time for an oil service. Need alot more info to proporly guess at this problem

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.

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?

problem here is a ticking to one is a knock or a tap or a thud ect to others so of my experiance with engines if its a ticking that gets louder with the engine getting warmer its got to be the tappets its the only thing that would get louder if it gets louder when accelerating it could be ignition timming causes pinking most other things on engines that cause ticking sounds could be something catching fuel pumps cause a ticking noise but are not normally affected by engine temp yates210456