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Discussion Starter #1 (Edited)
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I have for sale an aluminum driveshaft that'll fit a foxbody mustang. Its 45½" from center hole to center hole and 3½" in diameter. Text for more info.
Retails $360. Does not come with u joints, or yokes.

Summit Racing Part Number: FMS-M-4602-G
Transmission Joint Style:1330 U-joint
Differential Joint Style:1330 U-joint
Driveshaft Style:One-piece
Length (in):45.500 in.
Diameter (in):3.500 in.
Quantity:Sold individually.
Notes:28 spline yoke.
In-Store Pickup:Choose In-store pick-up (OH, GA, NV) on our web site.
By using a lighter weight driveshaft, you reduce its rotational mass while it is turning, freeing up horsepower, which translates to faster speeds and lower ETs. These lightweight aluminum driveshafts are just the ticket. They feature high-strength, .114 in. wall thickness, a 6061-RT62 aluminum seamless tube, and include 1330 high performance U-joints. They weigh approximately half as much as your OEM steel shaft, but are twice as strong!

A little bit of info;

Dependent on vehicle year, Mustangs came equipped with varying driveshaft dimensions. Early model Foxbody Mustangs (1979-83 ½) had a diameter of 2.75" and a length ranging between 45.51" and 46.25 inches. The later models, starting halfway through 1983, were equipped with a beefier 3.00" diameter driveshaft, with an average length of 45.49 inches. All were made of straight steel tube, had a wall thickness of 0.065" and came factory balanced and dampened (generally with a cardboard lining) to reduce noise and vibration when under way. Under normal circumstances, the factory driveshaft is more than adequate to handle a stock 5.0 (rated at 225 HP, 300 ft-lbs) and in fact, can go a long ways more in terms of power before breaking. So, knowing this, why consider an aftermarket shaft?

There are a few reasons. First of all, any aftermarket driveshaft will either be made of aluminum or carbon fiber, the most common (and financially achievable) being aluminum. The stock steel driveshaft weighs approximately 20 pounds, whereas a Ford Racing aluminum variant tips the scales at around 13.5 pounds, for a savings of 6.5 lbs. On the surface, that doesn't seem like much. However, because the driveshaft is a rotating mass, a lighter driveshaft results in less rotating mass and thus allows for slightly greater acceleration.

Secondly, aluminum does a better job at vibration dampening, thus allowing for a smoother ride at all speeds, but particularly so at higher speeds. Furthermore, an aftermarket aluminum driveshaft is not only stronger than their steel counterpart, but stiffer too, meaning more efficient transfer of power to the wheels.

To summarize the above, the advantages of an aluminum driveshaft are:

1. Less weight = less rotating mass, less rotating mass = greater acceleration
2. Stronger, can handle more power
3. Stiffer, can better transfer power
4. Smoother, less vibration and noise
 

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What year pony is out of? How much you asking?
 
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