1988 Mustang stock posi? - Mustang Evolution

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Old 12-23-2011, 04:30 AM   #1
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1988 Mustang stock posi?

Did the 1988 Ford Mustang 5.0 automatic come stock with posi? and if so was it 28 spline or 31 spline?
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Old 12-23-2011, 05:12 AM   #2
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1988 Mustang stock posi?

Keep in mind not ALL trucks use 31-spline axles. Just the ones that are well optioned. My 2003 Ranger Edge 2WD came factory with an 8.8 open differential using 28-spline axles.
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Old 12-23-2011, 05:42 AM   #3
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1988 Mustang stock posi?

Yes, it has Ford's Trac-loc limited slip. although by now the clutch packs have probably worn out and it's effectiveness probably has been reduced. IIRC it's a 28 spline axle, the trucks go the 31 spine axles.
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