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Our car had the small 71/4 rear, by no means able to handle what we wereabout to throw at it. Like I said before, we got lucky with an 83/4spanner along with our engine, and after we install our built-742 casedifferential, it will be fine. The price of upgrading to an 83/4(especially in an A-Body) is climbing, especially if you want the larger41/2-inch bolt pattern axles, so plan accordingly. While you cancompromise with the 81/4 under some circumstances, the 83/4 remains therear of choice for most non-Hemi street cars.