I prefer to use the cone type sure grip in my street cars. I have found that they seem to work much better in wet or snow conditions.

I drive to the track (for over 30 years) and have had 5 different gear and sure grip combinations. The car has been driven in the worst snow conditions with a 4.10 gear and the cone type has worked best for me.

I've seen both units fail for others, I guess I have been lucky. My street 440 makes a broad 500 plus foot pounds of street torque. I have been quite abusive with all of them.

Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen! Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!