I'm having a hard time finding when the oil in the rear differential needs to be changed. Also, I read that the trans fluid doesn't need to be changed but I heard from other people that it does. What have you all heard? Thanks
Differentials should be changed every 20k if
using your vehicle for police, taxi, fleet, off-road or frequent trailer towing, per your owners manual. Now the transmission is a lifetime fluid. But I'd recommend no longer than 60k between fluid and filter changes.