Rear differential flanges may require bolts and a washer or bolt, nut and washer.
Photo courtesy of Mitchell1
HOLE-type flange featuring bolts, nuts and washers.
This bulletin provides information related to changes in the rear differential flange on 2017-2018 Genesis G80 and G90 vehicles.
Rear differential assemblies produced after March 2, 2020, have threaded bolt holes (TAP-type). Rear differential produced before this used through-holes (HOLE-type) with a bolt, washer and nut.
Photo courtesy of Genesis
TAP-type bolts for threaded flanges.
Both differentials are compatible, however, a different bolt and no nut is required when installing a rear differential with the TAP-type flange into a vehicle originally equipped with a HOLE-type flange differential.
Bolts for use with the TAP-type flange are P/N 49319-T1000. For HOLE-type flanges, the bolt is P/N 49319-3M000 and the nut is 49329-3M000. Washers for use in either type flange is P/N 49339-3M000 (silver) or 49339-3M100 (black).
Tightening torque for either type id 65-79.5 ft-lb.
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety ofspecialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.
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