Hi,
Power shifting is when you change gears without letting go of the gas. Speed shifting I think is when you change gears without disengaging the clutch (could be dangerous). Be careful though.
I don't normally do this because I don't have a short-throw-shifter and I fear I might miss 3rd gear and screw something up.
Bye!
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Gautam N. Lad
http://www.cubicdesign.com
http://www.cubicdesign.com/mustang/