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Old 10-01-2011, 06:54 AM
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Best 97 Thunderbird or Mark VIII rear ratio with GM Vortec

I'm looking at 97 Thunderbird or Mark VIII irs for my '37 Buick.
1) Can anyone recommend the Best 97 Thunderbird rear gear ratio with GM Vortec LH6 or LC9 and a 5 or 6 speed automatic transmission? I want the car to be a daily driver so probably the best gas mileage that still feels like the car is not underpowered. The combination will be in a '37 Buick Roadmaster with an overall weight of 3700 to 3800 lbs.
2) Is positraction important?
3) Is alum of the Mark VIII worttwhile? How much does it save in weight?
4) Can I tell what a rear end is by lookikng at it?
Thanks

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Old 10-01-2011, 01:14 PM
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Limited slip is always better than not. Look for the ratio number with an "L" by it on the tag. As for ratio, I'd say do your own math. Decide what rpm your engine best wants to cruise at, plug in the tire diameter, overdrive ratio and you should come up with a final drive ratio that suits your style.
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Old 10-03-2011, 12:19 PM
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Thanks for the feedback. Found '97 Thunderbird rear assy complete with rotors and brakes. It's not positraction but only has 16000 miles. Paid $225. Rotors are right at nominal for new rotors. Should work fine.
1) Does anyone know if the rust on the rotors should be cleaned off by machining, or is there a different method?
Thanks
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