Front driveshaft problem

[NW99XJ]

Pictures always help.
Flip that driveline around (like in the picture Mudderoy posted) and you "should" be fine.
But like the others said... I would consider swapping out that low pinion dana 30 for a high pinion dana 30.
It will be a direct bolt in, and will help your issue of vibrations slightly by reducing the overall angle.
I would still however, have that driveline looked over, and have it rebalanced.
(doesnt cost much, and gives you some peace of mind)

[Mudderoy]

Ahhhh that's where I was confused, that's the front diff. I thought it was trying to use a front drive shaft for the rear. I see the long arms now. :S