Would the Driveshaft still spin even though the tires dont? I'll take a look later today and give feedback.
As explained above, your axle shaft on the passenger side is not one piece. It's two axle shafts that get locked together by a sliding sleeve/collar. If the sleeve/collar for whatever reason (lack of vaccuum, bad vaccuum motor, bad vaccuum switch, and etc.) is not sliding into position, then your front axle is turning, and only one axle shaft will turn (just like in the back) because you don't have lockers...
Since one axle shaft has a big old wheel and tire hanging on it (driver's side wheel and tire = resistance), the spinning motion from the drive shaft all gets transmitted to the passenger side shaft (through the spider gears)... Since that shaft isn't engaged to the outer shaft through the sleeve/collar, the passenger side inner shaft (next to the pumpkin) will be spinning like mad without either of the tires turning.
If you want to test this, get it going in 4H, and manually start spinning the driver's side tire forward. It won't be hard to turn and if your wheel/tire is small enough, it will probably keep spinning as long as you leave it running.
If that doesn't work, take off the driver's side tire and repeat the test outlined above and it will. You'll see the driver's side spinning.
The only exception to what I've stated above is if you'd broken something in the front end. I strongly doubt that this is the case, because if it had, you'd be talking about the horrible sounds it was making.