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UPDATE:
New balancer is in and wobble is gone, idle is smooth as glass!!
My thoughts on the experience:
Steering rack sucks (especially doing it alone)
Balancer bolt was tight but nothing a 3' breaker and 200lbs of beefcake couldn't take care of
Install tool is a necessity, I ordered one from LS1 tech and it made the job cake.
Pinned the crank and hope to never deal with it again!!
underdrive pulleys will reduce the charge on your battery at idle
What is other's experience with them?
Luckily mine is charging at almost the same voltage as it was prior to the install. I've ran underdrives on LS1s before and never had any problems with the charging. I'll keep an eye on it though.