Bill,
I've had them on for 40K now and I use a BD 4" Brake at all times too. They are as good as they are claimed. Lots of the NAPA stuff is. I like NAPA, they have things that the other places look at you crosseyed when you ask about them.
Chris
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520 Rear Wheel H. P. and locomotive level torque = 15. 5 sec @ 97 mph with the rear wheels spinning in 5th gear going through the traps in the quarter mile. No slicks here, pal, no fancy auto transmission, just the truck in full street trim, 7400 lbs. of Auto Wurks Diesel/BD Performance raging, fire-breathing DIESEL POWER