Check the axle code on the white tag on the drivers side door jam. Make sure it is not a 7.5 Ford rear, instead of the 8.8 rear. The 7.5" is more narrow and may be close to the same size an A-body, but the upgrade in strength over the 7 1/4 is minimal. The 8.8 is very strong. If there is no door tag, check the diff cover. An 8.8 cover looks like a square with rounded corners, the 7.5 is more or an oval shaped cover.
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