What was found
AFTER TAKEOFF RETRACTED GEAR, INDICATED UP BUT SOUNDED MORE ABRUPT AND LOUDER THAN NORMAL. INDICATIONS WERE NORMAL UNTIL PASSING THRU ABOUT 11000 FEET AND ACCELERATED THRU ABOUT 260 TO 270 KNOTS. THEN WE HEARD A SERIES OF 3 TO 5 SECONDS OF LOUD THUMPS AND BUMPS LIKE THE NOSE GEAR WAS TRYING TO RETRACT STILL INSIDE THE NOSE WHEEL COMPARTMENT. THIS HAPPENED FOR 3 TO FOUR TIMES WITHIN ABOUT TWO MINUTES. THE LAST TIME, GOT A CROSSHATCH ON NOSE GEAR AND THE OVERSPEND ON SPEED TAPE. SLOWED AIRCRAFT TO 200 KNOTS AND INDICATION REMAINED NORMAL. AFTER DESCENDING TO 8000 FEET PUT GEAR DOWN AND GOT ALL NORMAL INDICATIONS. RIGGED NOSE UPLOCK HOOK RELEASE CABLE AND PROPERLY INSTALLED CLEVIS BOLT AT THE UPLOCK HOOK. FUNCTIONAL CHECKS AND EMERGENCY EXTENSION CHECKS AND SYSTEM OPERATED NORMALLY. ALL WORK DONE IAW 680A MM 32-34-00