my dakota is so long that I have a 2 piece shaft from the factory, and I HATE it! I think that's my weakest link right now and would love to toss in an aluminum shaft, but everyoen says no go

I don't really care if it ends up being made out of a solid steel rod! but everyone says it's too long and a 1 piece shaft cannot be made for it.

when I swapped in the 4.56s I noticed a driveshaft vibration now too...when the rear axle had 3.21s I would have had to drive 125mph to feel this vibration, but now the 4.56s and tire diameter change, my driveshaft speed is MUCH higher, and I can feel the vibration at 65mph.

what's the longest shaft anyone has ever used?