OK, easiest way is a slide hammer with an adapter. Two whacks and it's out. Next best way is a prybar between the axle and tranny.
DO NOT pull on the axle itself, you'll just pop a boot. You're suppose to pull on the short piece stuck into the tranny that the boot attaches to.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne