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You should be able to replace the timing chain while the engine is on it as long as there is nothing in your way. Make sure you have enough clearance so you can work, and that you can remove the sprockets(if needed) and the old chain first. Be careful not to get too much dirt on the new chain.
My first check would be the condition of the chain and sprockets. Check to make sure all of the teeth are still ok and if the tension of the chain is correct and that it is well lubed.
If the noise is more pronounced from the rear and chain and sprockets are ok, it could be the differential that has either failed bearings or damaged gears.
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