4x4 Transfer case Questions

The transfer case on a Blazer 4x4.

1. When the transfer case is in 2 wheel drive, is it a 1to 1 ratio??

2. Is the VSS (vehicle speed sensor) mounted on the transfer case or transmission???

Any clue to the above will be greatly appreciated

Thanks

2Hi and 4Hi are staight through what comes out of the tranny is what you get 4 low is a geared down in the T-case and the speed sensor is on the T-case on the back next to the rear drive shaft