No clunking from my 2013 M6 ZL1 convertible with 57,000 + miles on it.

I have no direct experience with that part - but in concept I like the idea. It looks like a nicely crafted part, and I think there is wisdom in offering different bushings for street vs. track - no doubt the factory kept it ultra soft to prevent noise transmission into the car. If you've ever grabbed ahold of the factory driveshaft while it's in the car - you can move it around in the factory carrier quiet a bit. Undoubtedly there is all kinds of movement going on when you apply several hundred ft/lbs of torque to it.

My "problem" with it is that for what it costs, you're over a quarter of the way towards a 1pc driveshaft - which eliminates the carrier bearing, but more importantly eliminates the rubber giubo couplers at the transmission and rear end. Those things are easily as much, if not more, of the spring and slop that the driveshaft of these cars have, and they are also a common failure point when you really start to crank up the power.

As with most things, it depends on your combination, and how you use it. I definitely think there is a place for something like that.

Here is a video I have one the 1pc driveshaft. There is a clip in here of how much slop the carrier bearing has - check it out:

https://www.youtube.com/watch?v=Do12rtaDizY

Thanks very much for your valued feedback! I’ve been seriously considerings a one piece aluminum DS for quite a while for my 490hp/425 torque street only car to provide a little more nimblebess/quickness in 1st&2nd but cost is holding me back. I just came across this bushing product and thought it might somewhat improve what I’m looking for.

I did watch your video and the slop in the carrier bearing was shocking :yikes: …could you feel it during normal street driving? Also were able to put the heat shield and exhaust shield back on after you installed the one piece? Thanks again

It's hard to say exactly how much of the slop/spring feeling was the rubber couplers vs. the carrier bearing. I can tell you that replacing it all definitely was noticeable. It wasn't huge, but a definite improvement.

I didn't put the heat shield back on. I'm honestly not sure if you could, but I think not given the additional size and straight line from trans to rear end.

I know its been a few years since I've seen and replied to this thread. Having good seat time since my ZL1's infancy has generated some thoughts about the M6. To a novice the manual may seem imposing. I have found that the driveline can be forgiving to newcomers. When you get up to speed on the driveline, you will find that it is very responsive, and explosive when it comes to acceleration. It also reacts very well to different shifting styles with the clutch. GM's Automatics are very good transmissions, so I don't have a bad word to say about them; IMO any 5th gen ZL1, and especially the 5th and 6th generation 1LE, you would be missing out on a great driving experience without a 6 spd. manual.