Wanting to install 8 inch Skyjacker 71 burb... Issues?

[Roadhog]

Hello due to running 16.5 rims, I was between a rock and a hard place and got some humvee 37 tires which I do like. I was hoping the 4-inch Rancho would be enough, but after the tires were mounted up, it is clear that I will need to step up my lift to accommodate the tires. Im trying to avoid trimming at all costs since all the body and paint work are already done.

The only lift kit I can find for my year is a Skyjacker kit. I'm thinking that the 8 inch kit will do the trick and keep me from rubbing even when going on mild trails (hunting). My question is, what modifications will be needed? Am I going to have to lengthen the drive shaft or will a transfer case drop kit do the trick? The Skyjacker web site any states modifications "may be necessary". Any help or insight would be greatly appreciated! I will be ordering and installing in about a month. I attached a pic of it with the tires installed on the rims, thanks!