mustang 92 question about the 31 spline change..

[98 NosStang]

when doing the axle spline change what needs , to be changed also, in other words, what do i need to buy.

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1998 MUSTANG GT 4.6L /Convertible, Automatic. Flowmasters, JBA shorty headers chrome, X-Pipes custom made, 3.73 Gears FMS, 70MM fms T-BODY, BBK cold air induction system W/BBK Filter, 150 SHOT Dry NOS KIT (with the teatherd cord attached to the steering wheel), BBK Fuel Pump, 4-Point HOOKER HEADERS chrome roll bar, STEEDA underdrive pulleys, NEX Racing bucket seats(19 LBS PER SEAT),5-Point harnesses, BLITZ carbon fiber black lite gauges temp. & press.