What would cause the transmission to be engaged and spinning while in neutral?

[Blue AWD]

Just R&R the clutch and flywheel and RMS. It is a Southbend stage 4 clutch that I've been running, just rebuilt, non sach unit clutch. Car is still on jack stands, no axles or driveshaft installed. Clutch bleed. In neutral, with clutch not pressed, the speedo shows 5 mph and axle brackets spinning, press the clutch in and speedo drops to 0mph. No unusual sounds and pedal feels pretty good. I've done this job a few times in the past.

If put in gear everything seems to be working.

Any ideas? Slave cylinder?

[Zba]

This happens when there is no resistance on any of the wheels. Put it on the ground and it's not going anywhere. There is still a physics connection from the engine to the trans. input shaft shaft.

No biggie.

[axnjaksn]

What ZBA said, everything is still technically connected, put her on the ground and let her rip!!

[Blue AWD]

Ok awesome. I somewhat thought this may be the case but I had never noticed this the other times. Thanks.