I don't know how wide your fenders are but here is some info that may tell you how wide to make your rear end:
http://www.ford-trucks.com/article/...F1_and_F100_Rear_Axle_differential_Swaps.html
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http://www.ford-trucks.com/article/...F1_and_F100_Rear_Axle_differential_Swaps.html
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Best Car Insurance | Auto Protection Today | FREE Trade-In Quote