Add a quart of Lucas brand gear oil to the differential. You can buy it at an auto store, or have your garage technician do it for you. Or; If you have a switchable drive system, try switching it to 2 wheel drive, or snow position. Good luck. This will be an expensive repair at the dealer. Also click on the link below. Like the engine you may need the differential oil changed. https://www.yourmechanic.com/estimates/acura/mdx/differential-gear-oil-replacement
Answers & Comments
If you have never done this before your best bet is to take it to a reliable garage . It takes special tools to set up a diff .
Add a quart of Lucas brand gear oil to the differential. You can buy it at an auto store, or have your garage technician do it for you. Or; If you have a switchable drive system, try switching it to 2 wheel drive, or snow position. Good luck. This will be an expensive repair at the dealer. Also click on the link below. Like the engine you may need the differential oil changed. https://www.yourmechanic.com/estimates/acura/mdx/differential-gear-oil-replacement