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Old 10-20-2012, 08:58 AM
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The Malibu 7.5 is 58 inches wide. That's 2 inches narrower than a Nova rear end. The 7.5 is not very strong, but you can help it by installing a 28 spline Eaton Posi, 28 spline Moser axles, T/A Performance cover and correctly setting up the gears. If your 7.5 is mounted by the axle tubes then you need to strengthen them too. The 7.5 has 2 5/8 inch tubes, which are not as strong as the other GM rear end's 3 inch tubes. You can fully weld the tubes with nickel to help hold them in place in the center casting. The plug welds tend to break when the rear end is mounted by the tubes. Nickel is the only material that you can use to join steel and cast iron. Welding them with steel will look fine, but it will break away from the cast iron if it's stressed.
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