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88 superliner viberation on acceleration

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Ok so my superliner with a e6 350 has developed a viberation mostly felt when accelerating above 1500 rpms on the highway. U joints and driveshaft is tight and was replaced less then 6 months ago. I can't figure it out. My belts did come off and apart a week ago but I assumed it was cause they were old cause when I replaced them everything is good. Now a 1000 miles later I have this viberation. I really feel it in the fuel pedal. Any suggestions?

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Is your truck air ride?

"Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin

"If your gonna be STUPID, you gotta be TOUGH"

"You cant always get what you want, but if you try sometimes you get what you need"

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Ok found some problems. Right motor mount is shot. Replacing that now. Also u joint on trans yoke is little loose. Just gonna replace that too. Lastly my pinion seal that comes out of the front rear to the rear drive shaft is leaking. Replacing that now too but found the yoke has a little movement. Guessing some bearing inside is starting to fail. Might be time to scrap the camel back and these 4.64 rears and go to Mack ch air ride with 4.17s.

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