Check your wheel bearings. Jack up the rear end a compare play in the bearings on each of the back wheels.
There is probably something not bolted correctly and is coming loose
the clicking noise is either, a) the motor assembly of the speaker rattling, B)cone rattling, C) its just blown. it will need to be replaced either way.
When a hub bearing is broken it will create a rattling sound as the wheels spin. The after a car accelerates the louder the hub bearings will sound.
The rattling and whistling on the 94 Explorer sounds like an exhaust problem. Check the exhaust for any leaks or loose connections.
It might not be the gearbox. Does it sound like it's coming from below the gear lever? I had the same problem in mine, and it turned out to be the exhaust, which was loose and rattling. It was fixed by putting a hard rubber spacer between the pipe and the car.
sounds like your valves are rattling check your oil
more than likely the tensioner
most of the time you will smell a rotten egg smell if its bad, or if you hear a rattling noise coming from your exhaust
Get a new car................ -___-
It may be your catalytic converter. Ours did the same thing with an automatic transmission. We sometimes thought it was the transmission, then we received a recall on the converter. Took it in to be replaced, and no more rattling.
lifters are beginning to go. timing chain (if vehicle is equiped) may be coming loose. and or exhaust pieces are loose.
it could be the rotors