AWD problem

[subru92svx]

I have a 1992 LS-L and while working on my car I had it on a lift. I started the car while in the air, but only the 2 front tires were moving. Is this how it is suppose to be? A bunch of other students at school were tryin to tell me my car was messed up. I called the Subaru dealer near me and explained. They said it was normal, but I don't know. The car does not make any strange noises or anything. The only thing I could think of was about 30,000 miles ago I had a shop fix my differential after I chipped teeth off my ring and pinion. I thought if something was wrong maybe they messed something up while they were working on it. Do all four wheels spin when your SVX's are in the air and running? Would appreciate any feedback. Thanks