1999 Porsche Boxster

1999 Porsche Boxster
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replaced clutch master and slave cylinders, drive
belt and front and rear brakes... cannot get
shifter into gear if vehicle is on ground we cannot
get the shifter to go into any gear, raise up on
rack and it is fine.... if while up on rack you put
parking brake on... again it will not shift...you
have pedal but the shifter will not go into any gear...
any help appreciated....