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  #16 (permalink)  
Old 10-10-2012, 03:44 PM
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Wheel width is not measured at the outside of the wheel. It is measured on the inside where the tire bead seals around the edge. Back space is also measured here.

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Old 10-10-2012, 08:08 PM
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I will try to pull the rear wheels off my coupe in the next couple of days and get accurate measurements for you. My tires have almost no sidewall buldge. Anyway, I'll try to get back with no question answers to your questions.
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Old 10-20-2012, 06:14 AM
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Quote:
Originally Posted by big gear head View Post
It's going to depend on how wide you want it. The X body rear ends are 60 inches wide and the 2nd gen F body rear ends are 61 inches wide. (....If you don't need strength you could use a G body 7.5 rear end that is 58 inches wide.....)

That chart has been around for a long time and is in serious need of some corrections. The '67 to '69 Camaro, '64 to '67 Chevelle and '68 to '79 Nova rear ends are all exactly the same width at 60 inches. The chart has them all different. Also the '68 to '72 Chevelle and '70 to '81 Camaro rear ends are 61 inches wide, not 62 1/2 like the chart says.
Todd, I am getting a '38 with an '80 Malibu 7.5 axle already in it. Is there any way to increase the strength of the components and add a posi ? It may be easier to modify it than hunt down an 8.5 Nova axle.

Thanks !!
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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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Old 10-20-2012, 06:39 PM
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Thanks Todd, I'll check into the mods you suggest and weigh the cost against swapping in a 8.5. I located 2 about 60 miles from me. They would need a power trax or similar installed for posi.
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