Update - Driveshaft and Wiring Harness
Driveshaft is now shortened and all new u-joints installed. I had a local driveline shop do it from a LS shop recommendation. Cost me $220 for all.
And I sent back my wire harness to brothers and they swapped it out for me to the classic version. There is quite a bit more in this box. Very nice and I am anxious to get started installing.
