Chevy & GMC Vans

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

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.