Ok all I need help! 97 4 door 4x4. It has an occasional growl that sounds like its coming from the passenger front. It sounds like the unit bearing is growing off and on. Doesn't matter the speed or if the steering is turned or straight. So far I have replaced the passenger unit bearing. I changed the front brake pads and rotors. I have also unplugged and capped the vacuum line going to the 4x4 actuator. None of these has made a difference. My next thought is front differential but I'm at a loss. I can't recreate it in the shop with the front end on jack stands. Please help its driving me crazy trying to figure this out.

 

Update... after walking away from this for a day I figured it out. Start with the simple basic things lol. Front diff was low on oil and drivers side axle seal is leaking. So looks like I'll be changing that soon. I got do fixated on the passenger noise I didn't think to look at the other side.