You mean what company to buy from or what brand of gear? I buy everything from West Coast Differentials. As far as brand, either Spicer if you have a Dana axle or Richmond, ive even ran US Gear, and ran the house brand for WCD "Sierra Gear" in my Toyota never had a problem with any. I think the Sierra's are made in Italy.
One I would never run would be Genuine Gear from 4wps. JMHO!!
I prefer Precision gears(what I run in my personal rig), or Dana/Spicer. they set up sweet, and have never had a problem. Sierra gears suck, they set up very poorly, but they're still working in a truck that's wheeled hard. I've also had pretty good results with Yukon, U.S. gear, and yes even Genuine gear. That's just my personal experience though
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