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 On the left is our stock case. On the right is a Ford Motorsports case that Cook will be using in a gear build for a team racing in NASCAR’s Camping World Truck Series. You can see the extra vertical rib in the red case and also how the horizontal ribs are extended farther to the end near the bolt holes to strengthen it. The red case is also nodular iron instead of cast iron. Sometimes, you can find a gear case like this in a classic Mustang, but they are getting pretty rare in the junkyards. Still, Cook says the standard case we’re building will be more than strong enough for Street Stock racing.