Well we got some snow last night and i took out the Cherokee to see how the 4X4 work in the snow ( just got the jeep a little over a week ago) when its in 4 wheel drive i notice some noise from the front not constant but there often enough while going straight or turning forward or reverse, a grinding sound. no noise or wheel wobble when in 2 wheel drive. does it in part time 4 and 4 high, never checked 4 low. I think it might be the wheel hubs, cv joint axles, or a actuator not fully engaging, any suggestions?

 

one more thing unrelated i plan on changing the gear oils front and rear, the trans fluid and filter, and the diff fluid this weekend any suggestions on what type i should use?