2005 AWD problem with front dirve

[greenland]

Hi

I have a problem with the front wheel drive on my 2005 AWD astro.

The ATC 20A fuse keeps burning as soon as I replace it.
Only keeps the front wheel lock in drive for about one wheel rotation.

The Service AWD lights comes on, and I get a error DTC 321 , which I think means "vss speed sensor irratic"

DOes anybody know this kind of problem ?

I need the AWD here on Greenland.

Thanks in advance for any ideas

Tom

[LiftedAWDAstro]

The most common problem with the New Venture 136 transfer case is the shift motor going bad. That is the best I have right now.