Its not that hard, remove wheel, brake caliper (don't let the caliper dangle and put stress on the brake line...tie it up with a bungee cord or something), and the caliper bracket, remove brake rotor, pop cap off outside of hub, take off retaining nut, its big, depending on application (the size socket required to remove retainer nut is 36mm), and the old hub pulls off, install new hub and torque to specs. (189-254 lb-ft.)
You have to buy the wheel bearing assembly.
If it is after 1995 mark 4 it is easy bolt on, if earlier it needs cuttting and welding
Front or rear?
Front or back?
Wheel bearing maybe?
Go to http://www.lincolnvscadillac.com/tech/lincoln-mark-viii/Coil-Spring-Conversion/index.htm
You have to change the upper control arm.
If you're talking about the fenders and hood etc. NO but if you're talking about the suspension then YES
i have 1996 with v8 on my mark
You didn't mention front or rear, the rear is much easier, the front one is one pain.
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On the passenger side behind the wheel well liner toward the front the car.