I believe it will be a 8.8.. It being a v8 truck I would tend to think that it would be an 8.98. My 87 model 300 inline 6 even had a posi 8.8 factory so im fairly certain you have an 8.8
Bradley
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1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5.
Built Ford Tough Moderator
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