Unless you have a car that was, or is a 4 cylinder engine Mustang, you already have an 8.8 rear end. The 87 and later 5.0 engine Mustangs came with an 8.8 Track-Loc rear axle as standard equipment.
Are the rear drum brakes on an 8.8 rear the same as a 7.5 rear ? The reason I'm asking is I have a 7.5 with good brakes and an 8.8 I'm going to swap in that needs all the brake parts.
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I am also getting ready to do this swap on a '84 that I recently picked up.
Let me know how it goes.
From what I've read this is also the best time to upgrade your control arms and replace the spring isolators.