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the serpentine belt is an accessory drive belt --a/c --alternator--power steering--water pump--etc it does not have affect on timing ---if you have an engine knock while running that would more than likely be a "rod knock" "piston knock" from a burnt main bearing,piston wrist pin ,damaged rod --if your timing was off poor running ,misfire,no start ,banging in upper engine valves hitting piston,
you fail to menyion what kind of car and which engine. I can only guess that this is what is known as spark knock which can be caused by several things, most common would be low octane fuel. another more critical cause could be improper timing.
5.000rpm's high revs and you run into problems with valve bounce ( hitting pistons) ,ring slap, gudgeon pin knock, big end noise and possible main bearing noise . You may also be getting a hydraulic lock in the hydraulic followers that is holding the valves open too long. Unless the engine has been specifically built for these rpm's any loose ,worn on unsuitable part will cause problems I am thinking that you have around 100.000 miles on the clock after 7 years and the motor is not young Ford V8 engines specifically built for a 500 klm race are limited to 5.500 rpms because they destroy the timing chain if driven over that speed .
this is most likely a transmission filter being dirty and it needs to be changed regularly as does the oil in your van. this is inside the transmission and needs to be serviced to complete this job i do not recommend you trying this by your self as you could damage your transmission.
Sounds as If You Have A Chipped Tooth On the "RING GEAR" in the Differential (Rear Alex).
Is this Where You Hear The Noise Coming from? If So Remove Diff Cover With One Wheel OFF The Ground Trans In Neutral Rotate Drive Shaft and Look Closely For ANY Abnormal Surface on EACH Tooth of RING GEAR= the Large one And The "PINION GEAR" the Small one. If you find Chip or Rough spot Diff Must Be Rebuilt. Beyond that A Pinion Bearing can Also Make A Knocking Noise But the "GEARS" Will Be a Rhythmic Noise. I Hope this is of Some Help To You Good Luck !!
the most common issue is what is called piston slap, GM's official stance is that it will not cause any long term damage, in other words it is just annoying, my Corvette has the same noise, goes away in about 2 miles, had it to the dealer and that is what they said, and i agree with them because it has never gotten any worse after years or hard use/.