Lynn Chapmann (Fireman450) ran motives the first round in his 2wd...had a carrier fail and it took the motives with it. Not sure how many pulls they lasted but they were holding up.
I had the motive 4.88s. The quality didnt look very good when I got them,( I worked at a place that cut gears for big rigs and off road equipment.) Found some of the holes not threaded and had to leave a few bolts out. And like mark said they did hold til i busted the carrier. I am running all Yukon stuff now. (Gears, spool, and axels)