Installation Time: Afternoon
November 03, 2017
A lot of these reviews mention a dramatic difference after installing the DSS shaft (night and day, etc.). I think most of that must come from enthusiasm over something new. The differences in feel, of which there are many, are subtle.
But don't worry, subtle is good.
I never realized just how much drivetrain slop there was in my car. With the new shaft, everything related to changes in the state of the drivetrain feels smoother. Clutch uptake is instantaneous, downshifts feel like buttuh, throttle changes are quicker; it just feels... right. Also, as noted in other reviews, a good number of pops and groans on clutch engagement have been eliminated. Very nice.
An unexpected effect has been in the feel of the rear suspension. I thought I was imagining things at first, but it definitely feels less harsh going over bumps. I assume this has something to do with not only the decrease in the weight of the driveshaft (which is a sort of pseudo-suspension component in a solid axle car), along with the driveshaft's pivot point being moved farther away from the axle. It occurred to me that part of the reason Ford went with the 2-piece design must have been to remove some unsprung weight from the rear suspension. And while I doubt the DSS piece weighs much (if any) less than the back half of the OEM unit, the increased length gives the axle a bit more leverage when changing direction, effectively further reducing unsprung weight.
As far as a noticeable effect on hard acceleration... I can't really tell. These 5.0 cars are so fast to begin with, it's impossible to "feel" a difference at full throttle. It does feel a bit lighter on its feet, however, and more direct, i.e. throttle inputs more directly translate into drivetrain response.
The install was pretty dang easy. I managed it mostly by myself in about two hours with the car on jack stands, and I didn't need to remove the exhaust. I did have someone help me take the old shaft out the back and feed the new one in, but I'm sure I could've done that on my own, too, though with a bit more struggle and a few choice cuss words thrown in for good measure.
I've owned my Mustang for more than five years and after installing the new DS I wish I would've done it years ago.