What is your vehicle doing and why does your mechanic think the transmission is going?
It does need the fluid changed at regular intervals 40k or so. Was that ever done? Before I allowed someone to put a new transmission in I would have the fluid changed.
Did you buy this from a dealer or private individual? If you bought it from a dealer have them do that. If it was from a private individual, well..you’re on your own there. You have to remember when you buy a vehicle from someone’s yard or driveway that you buy it for the agreed upon price and then it’s going to cost you $1000 additionally in parts, $2000 if you have someone do the work for you. That’s my rule of thumb, double that figure for a Jeep.
Those figures are assuming that there has been no catastrophic problem like an engine overheat or leaking rear seal or the transmission isn’t acting up.
Here is the DIY for changing your fluid.
https://forums.nicoclub.com/cvt-transmi ... 72758.html
Here is a guy that did it four times on his 08 with good results.
https://forums.nicoclub.com/post6757581 ... l#p6757581