Regen did this too, but she usually threw up when she was drooling (she drooled on every ride, but lots of drool - barfing dog).
It was a sign of anxiety, it went away after 4 months. Short car rides to really fun places (hikes, pet store for a treat, etc) really helped, but ginger snaps made of real ginger also seemed to calm her stomach a little at the very beginning, given 10-20 minutes before the ride.
We also had Regen eat her dinner in the back of the car a couple of times (while the car was still in the garage) and would give her treats with the car running, but parked in the driveway.
Now she loves the car most of the time, on a bad anxiety day she'll still drool.
Regen, rescue female GSD born 4/09, adopted 4/30/2010.
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aka "Osa," WGSL GSD female born 7/08, brought home 12/24/10.