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Weight difference between axles

This is a discussion on Weight difference between axles within the Suspension and Handling forums, part of the General Help category; I am upgrading to a moser 12 bolt. With the 4.10 gears and detriot locker. How much extra weight am ...

  1. #1
    Rice Killa JwMonE99's Avatar
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    Weight difference between axles

    I am upgrading to a moser 12 bolt.
    With the 4.10 gears and detriot locker.
    How much extra weight am I looking to add?
    Also the 10 bolt is a 7.5 inch, what is the 12 bolt "inch" size?

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    Senior Member bigrondownhiller's Avatar
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    1996 Camaro Z28 vert

    12 bolt is 8.875".

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    Rice Killa JwMonE99's Avatar
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    How much heavier is it over the 10 bolt?

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    Rice Killa JwMonE99's Avatar
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    No one knows how much a 12 bolt or a 10 bolt weights?

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    Junior Member Paul Huryk's Avatar
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    About 40lbs... Strange 12 bolt to a stock 10 bolt.

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    Member ProwlerZ's Avatar
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    It will pull about .5" off your 1/4 mile time. There's a moderate weight difference, and a huuuge rotational mass difference. I understand the idea of upgrading the rear as planning for a future build, but you're about 200rwhp away from needing it, and you'd be better off building a 10 bolt. Just my .02

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    Junior Member Paul Huryk's Avatar
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    Quote Originally Posted by ProwlerZ View Post
    It will pull about .5" off your 1/4 mile time. There's a moderate weight difference, and a huuuge rotational mass difference. I understand the idea of upgrading the rear as planning for a future build, but you're about 200rwhp away from needing it, and you'd be better off building a 10 bolt. Just my .02
    The rotating assembly is only a few lbs heavier than the 10 bolt, the unsprung weight is 40lbs heavier - two different things.

    When i did back to back testing at the track, there was zero difference in times and mph that I ran. 3.42 10 bolt vs. 3.42 12 bolt.

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    I think it was Car Craft a few months back that had a good axle comparison article. Best recollection is that they had a 9", a 12 bolt, and an aftermarket axle. As I recall, axle weights were listed, but it primarily focused on the horsepower differences which resulted due to the pinion offset from the ring gear centerline. Interesting article...

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    Member Bouvers's Avatar
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    I plan to offset the extra weight of a rearaxle upgrade with gearing...

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