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I don't think it is supposed to be that noisy.............and did you check the transmission fluid before you took off? Is it dark or bright red? I suspect that you should get it checked before driving home and be gentle with it! The filter may be partially plugged and servicing this would be a good idea..........you don't know what kind of treatment it got and sitting a long time is never a good idea on these coaches. Hope that proves helpful here. Please get back to me if you need more later as all follow ups are included in our fee.
Were you able to get this resolved o.k.? Hope it wasn't serious and please get back to me if you need more. We can offer a phone chat service if you think it would be useful and quicker.