The 8.8 will hold up fine, Summit sells a set of 5.67 gears for an 8.8, i dont think they would sell something that wont work. They also sell the same ratio 5.67 gears for a 7.5"
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1988 Mustang 5.0 LX Convertible
-Mac Cold Air Intake
-K&N Cone Filter
-9mm FMS Spark Plug Wires
-Hedmann Headers 2.5" O/R H-Pipe
-Flowmaster 40 series 2.5" Catback
