2003 Polaris 3 PRO X Factory Service Manual, Page 199Get this manual
CHASSISBRAKESFINAL DRIVE Jackshaft Installation, Cont4Insert jackshaft through bearing in chaincase
5Install jackshaft alignment tool and secure with castle nut and flat washerTighten jackshaft nut securely to ensure positive bearing and jackshaft seating to chaincaseNOTE: Use of standard nut and flat washer for this alignment process will simplify the process as well as preserve the locking features of the lock nut for reassembly
Jackshaft Alignment Tool PN 287039913 Tooth Jackshafts PN 287153515 Tooth Jackshafts