Lowered my protege now it vibrates?

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Protege5
Lowered it about 3 inches and now it vibrates when im on the throttle and when i let off its fine, i aligned it cause i thought that might be the issue but it still happens so now im guessing i might need some shorter drive shafts any advice on what drive shafts to use or where to look? Or any other possiblities as to why it vibrates. I had my buddies at the shop tripple check my work so everything was nice and tight, could it be possibly trans or engine mounts? Before i lowered it, it would vibrate when slowing down from freeway speeds.
 
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