Renault Koleos Gearbox & Transmission Problems
Renault Koleos transmission issues
You don’t say what the transmission is, but I will guess that it’s a CVT, which was one of the automatic transmissions offered by Renault in 2011. I haven’t heard of such a problem with the transmission before, and it could be that it needs servicing and the oil replacing. Take it to a Renault dealer and have it checked.
Is it normal to pay $4000 for a clutch replacement?
It sounds about right to me. Replacing a clutch in a car today is not a cheap exercise.
Strange vibration in 2013 Koleos
You don't say which transmission it has; it sounds to me that it could it be a CVT? If so it might be the normal operation of the CVT you're experiencing. I would go back to your dealership and ask them to demonstrate how the transmission works.