I bought one from that A-1 Milwaukee like 6-7 years ago, was supposed to best quality, but it was totally off-balance & started vibrating the minute I installed it, put old one back & everything fine, so for sure it was their driveshaft that was bad.
if you notice any vibration (even minor) after install , then you know it’s the new driveshaft ,
( just a heads-up , since I had bad experience with that company. )
Hope you get a good balance one,

 

Did they give you a refund? I’ve heard only good things about the drive shafts?

 

Could have been a lemon it happens, usually a balance issue

 

They had a 30 day return/warranty policy, but Disco was down for 2-3 months , so by time I found out it’s bad , they said warranty expired. It’s ok, learned lesson to test part b4 warranty expire.

 

Definitely going to test it out. Thank you for giving me a heads up. Sorry about your experience dude.