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post #1 of 11 Old November 30th, 2010, 10:46 PM Thread Starter
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Aluminum Driveshaft Y/N

Is it worth putting an aluminum driveshaft in my 95 Mustang GT? Its a heavy car and shedding 20lbs off it couldnt hurt but is it a big upgrade and improvement for the money?
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post #2 of 11 Old December 1st, 2010, 02:27 AM
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If you're doing it for the 9lb (not 20) weight saving alone, don't bother. You only need an aluminium driveshaft if you swap in steeper rear axle gears.
The reason is that the steeper gears lower the road speed at which the driveshaft reaches its critical speed (where harmonic vibration begins to occur). A lighter driveshaft will have a higher critical speed so you can reach a higher road speed before it starts to vibrate.


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post #3 of 11 Old December 2nd, 2010, 04:04 PM
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Quote:
Originally Posted by Bullitt95 View Post
If you're doing it for the 9lb (not 20) weight saving alone, don't bother. You only need an aluminium driveshaft if you swap in steeper rear axle gears.
The reason is that the steeper gears lower the road speed at which the driveshaft reaches its critical speed (where harmonic vibration begins to occur). A lighter driveshaft will have a higher critical speed so you can reach a higher road speed before it starts to vibrate.
you mean if i get some 3.73 gears it would be wise to get an aluminium driveshaft??

Last edited by justi88; December 3rd, 2010 at 12:08 PM.
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post #4 of 11 Old December 3rd, 2010, 01:31 AM
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Not to invade the thread or anything but is it bad to have 373 gears and the stock driveshaft ?
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post #5 of 11 Old December 3rd, 2010, 01:38 PM
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not really. but like 4.10 gears its a good solution
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post #6 of 11 Old December 3rd, 2010, 01:43 PM
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Good mod, but there's better ones to do beforehand.

Function > Form, always
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post #7 of 11 Old December 3rd, 2010, 03:04 PM
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Alum. DS is kinda like pulleys. Slight difference, but when you put all these mods together, they can add up to some good weight savings / hp.

Also, when your under there, you can remove the huge hunk of metal under the rear end. Its very heavy, and just there to cut down on NVH. You dont need it at all. Its probably 20-30lbs.

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post #8 of 11 Old December 3rd, 2010, 05:47 PM
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yeah i removed mine a while ago
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post #9 of 11 Old December 4th, 2010, 07:54 AM
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Quote:
Originally Posted by justi88 View Post
you mean if i get some 3.73 gears it would be wise to get an aluminium driveshaft??
Yes. The higher ratio axle gear will increase the driveshaft speed at any given road speed so yes, a lighter driveshaft would be beneficial.


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post #10 of 11 Old December 4th, 2010, 07:57 AM
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Also, when your under there, you can remove the huge hunk of metal under the rear end. Its very heavy, and just there to cut down on NVH. You dont need it at all. Its probably 20-30lbs.
That "dogbone" weighs 9lb and you can indeed remove it without issue, but make sure that you leave the pinion snubber and bracket in place.
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post #11 of 11 Old December 4th, 2010, 08:40 PM Thread Starter
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I have 3:73 gears plus im upgrading what can be done then ill modify the engine all at once in the mean time ive done almost everything else but the fuel pump. I did buy the driveshaft and installing it next week
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