B&M 45048 PREC SHIFTER JEEP 99-01 JEEP WRANGL - Manual (Page 9)

STEP 27. Install shift knob.
STEP 30. Test movement of shifter into all gears. Be sure all the
parts have been securely tightened and shifter engages
into each gear.
DO NOT operate vehicle until all gears can be smoothly
and fully engaged. ENJOY!
STEP 29. Press insert into knob.
STEP 28. Install shift knob jam nut.
Tools: Drive, extension, 9/16 socket.