If your talking about where the half shafts sit in the diff..you'll pretty much want to remove the IRS diff to make it easy on the install. 1)Get car up on 4 jackstands with the tires about 8-10" off the ground in the rear and 4-6" in the front. A little angle is important to keep the trans from leaking when you pull out the driveshaft.
8)Remove brake calipers, two 15mm bolts. Use some coat hanger wire or zip ties and hang them from the IRS mount bracket or anywhere out of the way.
9)Disconnect Toe Link Bar from spindle. Pull out cotter pin. Remove castle nut 18mm.
10)Remove halfshaft/spindle assy. Put jack underneath bottom of spindle where it meets LCA, just support it. Mark the position of the eccentric washer on the Camber Bolt where the UCA mounts to the top of the spindle. You will realign these marks during reassembly to maintain current suspension setting. Forgetting to do this will mess up your tires and ride feel. Remove upper spindle/UCA bolt 18mm. Lower jack all the way down allowing the springs to stretch out. Remove jack. Remove lower spindle/LCA bolt 18mm. Pull halfshaft out about 1/2" Use flat screwdriver/prybar between diff and inner hub to make sure it is coming out of the diff. Pull halfshaft all the way out.
Repeat other side.
11)Remove two 18mm bolts from diff cover-to-rear bushing. Leaves the rear diff bushing bracket hanging momentarily while we proceed to get the diff out.
12)Remove Front Differential bushing bolts 15mm
13) Remove nuts off front (only) LCA pivot bolts 24mm. Leave the bolts in place though. This allows the front differential support brace to be removed.
14)Remove Diff. Support rear of diff with a jack, remove front support brace and diff will move forward and down and out of the car. It is about 70lbs so be careful. Do not tip it or you will spill "fish guts" the nastiest smelling oil there is.
15)Remove Rear Differential bushing bracket bolt. 15mm and lots of extensions from the drivers side. Very tough to get to initially. Easier if you also remove drivers side toe link bar from its inner mounting point 13mm bolt on bottom, 15mm nut above.
With it out, you can remove the old seals and bearings, then install the new ones. Make sure to put some lube on them so they don't run dry the first time, then install the diff in reverse of these directions. Hope this helps.
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1995 Mustang GT-Heavily Modded-Sold 2003 Ford Lightning-Sold 1997 Saleen-5.4 conversion-Sold 2005 Mustang GT-Torch Red-Sold 2003 Mustang Cobra-Oxford White 2003 4Runner V8 Sport Edition 4X4
8.8'' IRS Wheel Bearing Replacement 
