Stop in for a cup of coffee

That's about where I was with my Suburban once the 6 inch springs went in. When I had the driveshaft lengthened I had the yoke beefed up at the transfer case end, 1350 I think. So it will be a new driveshaft for you?
Something like this. 33C42E43-F52F-4841-A311-67C858414952.png It has a 4 bolt flange at transmission,should be pretty straight forward.
Will put weight on back end and get diff pointed before i measure. Then i can weld spring perches on.