Today I was under my Jeep removing the rear sway bar and checking the bolts on my skids, etc. when I noticed this cylinder shaped thing mounted to my rear diff. It's got a bracket that attatches to the top of the diff, which places the cylinder on the driver's side, between the diff cover and where the driveshaft enters the diff. I've never noticed it before and I've never seen pictures of it elsewhere, so I was wondering what it is. Here are a couple of pics of it (the quality stinks, the pics were taken with my phone.)

http://pictures.sprintpcs.com/i/108253905413_290.jpg?ext=.jpg&rand=2057888945244378723&border=2,255,255,255,1,0,0,0,0&outquality=90
Taken from driver's side

http://pictures.sprintpcs.com/i/108253158277_290.jpg?ext=.jpg&rand=-3453757175194255806&border=2,255,255,255,1,0,0,0,0&outquality=90
Taken from passenger side

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04 Sport - SOLD
Factory skids, All J's Super Skid II, Rock Lizard Skink Sliders, Frankenlift, 245/70R16 BFG AT's on Cragar Soft 8's, Cobra 75 CB

'04 TJ Sport - Solar Yellow, D44, stock for now

I believe you may be looking at a damper. Its designed to absorb or dampen shock and vibration from the axle.

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04 Rocky Mountain Edition
Detroit Truetrac in the front, Rusty's 2.5" Coil Lift, Revos
Custom Roof Rack w/ 4 Hella 500s, Optima Red Top, Mopar Rock Rails, All Mopar skids

Got a sprint error msg when clickig on both links

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New KJ Gear - Desert Armor Flak

2004 Renegade Light Khaki - 4" JBA Lift - Rock Lizard Products: Komodo Dragon Rear Bumper, Prototype Winch-mount Front Bumper, Super Skink Sliders - All J's Super Tranny Skid II - 31" Firestone Destination AT's on Moab wheels - Cobra 75W CB w/ stock Antenna mod

[b]Retired, US Military

You have a male KJ, that's normal.

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Slightly modified Lt. Khaki 3.7 2004 LTD 4X4. Purchased new 8/6/03.
What I don't have....A Mag light mounted to my seat.
Original Old L.O.S.T. #000354

Nick's Pics & Mods click here: http://www.cardomain.com/ride/531173
http://www.survivaltopics.com/forums/

That's the harmonic balancer for your driveline. I bent mine out on the trail and had some serious clunks when I hit bumps driving until I figured out what it was. When the bracket is bent it will contact the rear sway bars going over bumps making a horrible racket.

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2011 Nissan XTerra

Jeep balls...

Hahahaha


but the pics give an error msg.

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L.O.S.T. #31000

'03 KJ Freedom Edition - 4" JBA Coilover Lift w/ 32" Cooper STT PROs
'98 XJ Sport - 6" Full-Traction 4-Link Long Arm - Jeepspeed #2731 (Race Jeep)

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