1988 Jeep YJ strange vibration between 45 and 60 mph

1988 JEEP WANGLER YJ
263,658 MILES • 6 CYL • 4WD • AUTOMATIC
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D J TROTH
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Hello "Car Pros". It started around the 200,000 mile mark. I will be driving between 45 and 60 mph at 2000 to 2500 rpm. If I make a lane change and cross the lane devider bumps, the jeep starts vibrating and it feels like I'm driving on a washboard or a cattle guard. It goes away when I slow down to 40 mph. Then I speed up and keep going. It won't happen at 65 mph or faster. It doesn't happen all the time. I drive an average of 75 miles a day and this vibration happens about once a month. When it first happened, I took it to a Jeep shop and they replaced all the bad looking universal joints. That night it happened again. I took it to a drive line specialist and they rebuilt the rear end and put in new bearings. That didn't fix the problem either. I had it alighned and still no cure. I've been living with it by driving accordingly. Only certain road conditions will set it off. Thanks for any help
Jan 6, 2009 at 3:28 PM
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AIRSOFTSOLDRECN9
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Suspension is stock correct? Have you checked the inner and outer tie rods joints for excess play? Check the ball joints for excessive wear. More than likely if the alignment shop said nothing about the condition of the tie rods then it is most likely your ball joints.
Jan 7, 2009 at 12:01 AM