Help with my buddy's IMPY
 

May be a stupid question, but here goes. My bud has a 95 IMPY and he's got a vibration at 55-60 mph. I had this problem on my LT1 and went to an LS1 driveshaft to fix it. I was going to loan him my spare LS1 ds to troubleshoot, but the question is will it fit? I'm assuming no due to different wheelbase/chassis designs etc.. Let me know as it'll be a quick troubleshoot if it will. Thanks fellas.

won't fit

it could just be the tires out of balance if he hasn't checked that yet.