So with that in mind I ordered a new 4 inch aluminum drive shaft from the guys at Shaftmasters in Lincoln Park, Michigan. The drive shaft shipped out the day I ordered it and was delivered the next day. 

The first thing I noticed about the new shaft was it's weight or lack there of... While we didn't put the new shafts on the scale, I would guess that the shaft is around 14 or 15 pounds.  The stock shaft is about 40!  We also noticed the shaft was built with Neapco U-Joints.  From what I've been able to learn, Neapco U-Joints are American Made and are a high quality u-joint, which means a smooth spinning shaft!

So after all that, did the new drive shaft make a difference?  You bet it did!  I did a few spirited takes off from a dead stop. While I have no proof, the Mistress certainly felt peppier.  The acceleration was quick and smooth.  Now previous to the new drive shaft, at highway speeds (70 to 80 MPH) it seemed like the Mistress had some vibrations that felt like it could have been coming from the stock shaft.   I have since taken the car out on a couple of highway runs with the new shaft.... Vibration gone!  The Mistress is definitely cruising a lot smoother at these speeds

Bottom line...  The new drive shaft from Shaftmasters was a great investment! I am now very confident that I can put my car on the dyno and not worry if today is the day my drive shaft falls out! The new light shaft also seems to have given me a nice performance boost and an more comfortable ride!  So thanks to the guys at Shaftmasters for very nice product!

The new and the old...

Clipped in u-joints!

Yeah, baby!