I just want to share and experience I had with my E99 that I picked up from a 17 year old that built it with daddy's money and 0 knowledge. Please read if you are planning to lift more than 6"!
I pick the truck up, and I'm driving it home. It's low on power ( turns out #7 injector was unplugged) but goes not bad and sounds pretty good. I get half way on my 800km trip home and there's a horrible bang, grinding, all that stuff, the driveshaft had let go, and cracked the transmission case. 1000$ tow bill later its home and I tear into it. PLEASE learn from this mistake and none of you do this to your truck!
This is the carnage:
So if you notice how clean the tranny is? was one of the selling points of the truck, fresh rebuild from NADP. Local shop swapped the guts to a new case for me and I re-installed, 500$ later.
But that's not all here's the REASON for all the damage. I re-installed the driveshaft just to see how much play was in it, then decided to video.
The truck had a CV head drive shaft (unsure if that was factory, starting to think it wasn't) but it was way too short for the 8" lift, which you can see in the video is just blocks. I called the kid up and he ran it like that for 2 years he said. I should take pictures of the splines, they are completely worn off. I had new front and rear shafts built, both with CV heads, and new splines for less than 1000$.
Also had to replace the yoke on the differential as the Joint coming apart damaged it as well.
Do it right the first time people!