Is this from another fox body? SN95?
if is is from another fox body, change the fluid, add friction modifier. While you are at it. inspect the axle bearings and i would replace the axle seals, and inspect the brakes and wheel cylinders,.
If it is from a sn95 with disc brakes, then you will need the rear brake lines for that year, connectors for metric to standard brake line fittings, the E brake able and mount for the SN 95, an adjustable proportioning valve, an SN 95 master cylinder, and alter the E brake handle mechanism. I may have missed a few things. The tires will be moved out about 3/4" on each side,