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Hey im posting this for my buddy...anyone had any issues with vibes after installing 2 in spring spacers. My buddy claims after we installed his budget spacers that he gets a vibe between 30-40 mph....i never had this problem with my rubi, but his is a sport....any comments from the peanut gallery would help. Thanks
Pete

PS his JP is BONE STOCK...no other mods.
 

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the only thing it could be is if the bumpstop cups aren't bolted in all the way or the spring is not seated fully top and bottom. Maybe a bad spring?
 
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If all he did was a budget boost, then the cause has to be the rear driveshaft pinion to output shaft angles. I would check there first. What year is his sport?

Driveshaft Alignment

Ron
 
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Have him check his rear angles. I will bet that the rear pinion is off. Also check the centering of the axles, an offset there will also give vibes. I was fine being 1/4" off center.

Ron
 

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I got a Vibe one my Rubi after my BB lift. But only at 75 - 85
 
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