Need opinions on driveshaft for lifted Duramax Yukon XL

[KEVINL]

I finished installing my 7” Bds lift kit on my 2001 Yukon xl with a duramax swap i need to get rear driveshaft lengthed but i am wondering if i will still have a vibration problem afterwards since the wheel base is shorter than any pickup applications

I have attached some photos of the angles

Driveshaft are certainly something i know very little about

 

[2004LB7]

Vibration is more likely from the angles being different on the two u joints

 

[08lmm72mm]

Get some tapered blocks for the rear axle to correct the angle.

 

[malibu795]

Tapered blocks and longer drive shaft.
Good possibility the slip yoke it flopping around as it spins being that far out..