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Can you describe the noise?Also, is the check engine light on or does the engine run rough?
Since you can't seem to describe the noise, let me suggest the following.
The most common noises that I usually hear under acceleration would be an exhaust leak or a belt noise.
If the belts are loose you might hear a loud squealing type of sound, especially when you go up a hill and put a lot of pressure on the engine.
The exhaust would usually either rumble or rattle depending on the problem. Lots of times the substrate in the catalytic converter will break up and cause either a rattling type of sound or more of a whooshing sound when you get on the gas to make it up the hill. This doesn't always cause the check engine light to come on and if it's just louder then usual it may have a leak that opens up when the engine is under load.
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A grinding noise could indicate a loose or broken engine or transmission mount. This would allow the engine and transmission to shift and possibly touch the frame. If this is the case it can make a grinding sort of sound. I would have the mounts checked as well. Usually its a bad transmission mount that allows this to happen.
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Please read my second reply as I was mid answer when you sent your second reply to my first question.
It is at the back section of the tail shaft on the transmission. A large rubber block bolted to the transmission and the cross member under the truck.
As for the engine mounts, we are talking about the engine being able to shift is all. Not the engine itself making any noise, internally, just that it could shift and allow some vibration or grinding type of sounds if it's moving.