Thanks for the responses. Some more questions!! Do either of these lock-ups alter the clutch pull at all? I read that the slingshot had a heavier clutch pull than the DD. That was for a Raptor set-up though.
The pics I've seen of the SS installed, you don't see the pressure plate. Does the SS replace the pressure plate or does it just go over/cover the pressure plate? I'm running 6 HD springs right now, will I be able to go back to stock springs for a lighter pull, after installing either of these lock-ups?
I still have a few weeks before I'll be in need of one, but I think I'm leaning towards the SS, since HJR sells them and he will be doing the porting and my duneable overide.