Originally Posted by logan1
I have read a lot of the guys on the mustang forum saying that the spec 3 clutches can handle a lot of abuse and are very streetable. but ill do more research just to be sure.
I've tested many a T5 to the point of failure. My experience is that anytime the durability of your clutch goes up, the durability of your T5 goes down.
3rd gear is most likely to fail, probably because it's narrower than 1st/2nd, and out in the middle of the case where a little flex will allow it to move farther away from the cluster. That flex moves the tooth contact area closer to the tips of the narrower teeth, making them more likely to break. A little clutch slip on engagement (and a lighter flywheel), will help smooth out those destructive torque spikes. Here's a link to info on an inexpensive clutch slipper that can help you get the most out of your T5...
Clutch Slipper Pics/info