Thanks man... The only thing that concerns me is that the noise isn't consistent with rpm, doesn't do it at idle and is more related to ground speed. But the sound is identical. If it's not the OPDA then what else would sound like that. I hear that horrendous sound in nightmares. Is it bearing? Can't be belt cause it's not doing it idle. I'm just a little lost. Would the OPDA make noise and quit at idle?
Any engine noise will change with RPM. Driveline noises will change with speed. Could be a wheel bearing, a u-joint, who knows. Don't fear the '05-'06 Jeep. They are great Jeeps.
Check your wheel bearings. Jack up at the axle and see if the wheel bearing has movement by moving the 6 o-clock part of the wheel in and out.
Check your drive-shaft visually and if you want you can remove it and drive the Jeep and see it the noise is gone. The front shaft has a double cardan joint at the transfer case side and the centering ball can be dry/shot.
You can also check the rear shaft by removing it and running the Jeep on the front shaft only by using 4WD high.
2006 Solar Yellow Rubicon Unlimited
Jeep Club Member #1340
6 Speed, Hardtop
Mods done: Hurst tee handle, cheap hand throttle, Rokmen Merc front bumper, Warn 9.5 TI winch with 3/8" X 100 worth of Viking yellow rope, DPG OME Ultimate with JKS ACOS up front, Kilby Gas Tank Skid, Kilby Steering Box Skid, Jeep Medic Belly Up, Skidrow Engine Skid, Rockcrusher Diff Skid in the rear, Warn Diff cover in front, , AR Outlaw II's and MTR 12:50/15's, Homemade rear Bumper, Cheap Cobra CB, Puma OBA, Sirius Radio, Locker Defeat, Rockhard cage, Rockmen short corners, homemade tire swing/tailgate hinge affair, Airlift air bags on the rear- - - - - - and more to come!