I have a really loud humming noise in Tue rear end of my 03 JAG s type just wondering what could be the issue here?

sounds like the rear end

it's your front wheel bearing

I would get this into a shop and have them look at this asap. Sounds like you could be loosing the rear end on this SUV.

I had a similar issue and it ended up being a broken wheel bearing. I even ended up having two, one was broken on my front passenger side, and one broken on my rear driver side. The part costs about $280.00, but could cost around $400.00 with service repair. The noise of a broken wheel bearing can sound like a humming, and over time it becomes louder. The car can be driven with a broken wheel bearing, but doing so can eventually lead to other wheel/tire maintenance. MINI's endure this commonly due to their low profile to the ground. Here is a forum on further issues experienced, including the bearing, and efforts towards recalls. http://newmini.wordpress.com/2009/02/17/mini-cooper-power-steering-failure/#comment-884

When does the noise occur, while driving only, or driving and idle, in gear, or in neutral and park? If it occurs all the time (while driving and at a stand still in cold weather) it could be the fuel pump. If it occurs only while driving, it may be a wheel bearing. Describe the noise (humming, grinding, whirring, etc), and what is the mileage on the Pilot? Answer my questions so I can fine tune my answer. Thanks!

It could well prove to be a big job? by the sounds of it I would get it to a Jag dealer or indi Jag garage to be looked at properly.
It might mean that you need a new or second hand IRS unit.

clunking or grinding noises, wont accelerate to full potential,

CHECK YOUR TRANSFER CASE FLUID LEVEL ,SOUNDS LIKE IT NEEDS FLUID ,IF SO YOU FRIED IT.

This rear end needs to be replace or re-built


































This rear end needs to be replaced or re-built. The gears and or bearings are worn/shot. May be able to get a complete rear end from a Junk yard for much less, one in good condition. Good Luck

it would not hurt to check rear tire wear due to misalignment
cupped tires will cause a faulty bearing type noise or humming.