My "new" 98 Wrangler SE 2.5L has some gremlins (to put it lightly).
When driving I get a whine/roar that increases with speed and disappears when you step off the gas.
Normally I'd guess it was the differential, but I only get the noise in 3rd, 4th and 5th and the higher the gear the worse it seems to get.
I've scanned the forums and despite the multitude of complaints against the AX5 and it's crappy counterpart the Dana 35, I cannot find anything that resembles my issue.
I did find a fair bit of what looked like fine bronze in the diff oil, but the gears didn't appear to have any obvious damage and the pinion didn't appear to have any slop when moved by hand.
I haven't checked/changed the AX5 oil yet.
I was considering dropping the tail-shaft and going front wheel drive in order to test the rear axle.... Does anyone have any better ideas to help me isolate which one is at fault?