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Just finished swapping a D15B into my 97 hatch, the engine is running fine, idles a little high but I can adjust that, the problem is while the car is jacked up and started, the rotors are spinning at about 10 miles an hour when gearbox is in neutral (manual tranny off from old d16y7) and when I put it in gear it speeds up, but this happens whether it is on the jack plate or when it is on the ground with wheels back on it. Any help would be GREATLY appreciated.

 
Rep Power: 518

That is normal and expected.

 
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The problem is when the car has the wheels back on and is on the ground, it is still reading the ten miles an hour on the ground and it actually speeds up like "normal" when I put it into gear. But the car wont actually go anywhere.

 
Rep Power: 518

OH! (I didn't understand that part I guess)

Then you didn't get one of the axle stubs seated all the way into the differential, splines did not engage for whatever reason.

Or a CV joint came apart, but you would see part of an axle turning without the rest of it turning.

 
Rep Power: 0

That was exactly the problem, turns out that when I got my new axle, for some reason the keeper ring thing that goes on the end wasn't put on, luckily I found it but now just cant get it squeezed down enough to fit back in the differential.