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Old 06-06-2010, 05:22 AM
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04Rubicon35s is on a distinguished road

Hello I am new to the forum and pretty new to the jeep world so please forgive me for any ignorance that I may show. I have a 04 rubicon with a 4 inch suspension lift and 1 inch coil spacer lift. The problem I am having is when I first take off or start and stop again I am getting a really loud "popping" noise from underneath my jeep. I have no idea what it is or where to begin to fix it. Any help or advice would be greatly appreciated.
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Old 06-06-2010, 05:49 AM   #2
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My Jeep is a bit older than yours....'98 TJ with 115K miles. I recently went through something similiar....a noise I described as a pop/thud appeared underneath about two months ago. At first I only heard it on hills and turns at low speed. It got worse and started occuring when I hit most bumps. I took my Jeep in for AC and brake work and asked them to put it up on the lift and see if they can find the source. They reported they fixed it by replacing the rear sway bar end links. Not! For one thing, the mechanic that did the work then test drove it was elderly and deaf. (I verified they did change out the parts they said they did).

The noise got worse. I got under it several times and couldn't see anything. I took it to a Jeep dealer 60 miles away and had them look for it.....and asked them to check the transfer
case mount (got a tip on this forum it could be that) and sure enough, they found two loose nuts on the mount.....tightened them and cured the problem.

Yours might be a different problem. Tips and suggestions I got on here during this ordeal involved:

Check transfer case mount and motor mounts.
Check catalytic converter (chunk broken and rolling around)
Front and rear sway bar end links.
Front axleshaft CV Joint
Grease everything underneath that has a grease zerk.

Good luck! Let us know what you find.

Never argue with idiots......they will drag you down to their level then beat you with experience.
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Old 06-06-2010, 02:59 PM   #3
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It sounds like your U Joints. I have an 04 as well and I am having to replace mine
4 liter in line six, Bestop Highrock bumpers, Warn winch, light guards, grill guard, Westin running boards, Dick Cepec DC-1's on 33" Mickey Thompson MTZ's, pocket style fender flares, d-rings, hard top, tinted windows, a completely redone sound system with Alpine Type S in rollbar, Arc speakers in the dash and an Alpine headunit, Iggee's seat covers, 3" suspension lift, MBRP Exhaust System, IPF fog lights, steering stabilizers, a woofer, 12" ported Rockford Fosgate subwoofer and amp.
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Old 06-07-2010, 10:02 AM   #4
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Physically check with a wrench, Lower Control Bolts, Trackbar Bolts, Front DS U-Joints.
Then also check axle u-joints as well, grasp with hand and see if there's any excessive play in them.

Next I would move onto Ball Joints and Hub Assembly. Jack the front off the ground and grasp the tire top & bottom and rock back & forth watching the Ball Joints to see if there's any excessive play. Also same for the Hub Assembly, but just watch the axle shaft/u-joint area to see if there's excessive play.

98TJ / Hi-Lined / Zip Lockers / 35s

Family Rig / Tow Rig: 08 Tundra & 16ft Trailer
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