Rattling noise when accelerating from low gear
 

When I accelerate from a low gear, or from a stop, I hear a rattling sound from the 4Runner. At under 3000RPM there is no noise.

What could this noise be?
I've checked the accessible area for loose bolts, nothing.
Could it be the Transmission?

Thanks for your time!

pulleys. belts, accessory brackets? I guess I don't really know, but am curious as well, I think I notice it on mine sometimes

accessory brackets... i'll check that out.
Thanks, again!