I have a 2008 explorer v6 with 200k miles. It drives well but when i have load in my car or when i accelerate hard at a corner my car sometimes goes to neutral it doesn go just revvs go high than i put it at the low gear 1 and its perfectly fine than

Also sometimes when m cruising at 100 my gear struggles it makes a noise and down shifts and than immediately upshifts i dont know whats the issue the differential oil havent been changed on the car by the previous owner is it the diff cus i think this happens cus of the auto 4x4 which engages at times. I once manually engaged the 4x4 high and it was making a noise but working fine