5 years ago at about 100k miles my driver side went bad (a little slop doing the 12-6 o'clock wiggle test with the wheel off the ground). I still drove 3k miles across the country to get home so they often go bad slowly. I replaced it with a Timken.
I didn't replace the passenger side and it's still good at over 140k miles, although I need to check it since I just got back from a 4k mile trip.
Unless there is some major event that led to the failure (driving in flooded area or lots of river crossings?), then I don't think there is any correlation between one failing and when the other will. But some will feel that if one went, the other won't be far behind. Maybe. Maybe not. But again, I don't think so.
[added on edit] Also, some believe the bearings are not packed with enough grease which contributes to earlier failure. So, they take out the speed sensor and cram more grease into the hub. I bought "Timken" grease which is absolutely not a guarantee to be whatever they packed in the hub, and pumped some into the hub, but probably not enough to make any difference what-so-ever. But everybody should do what they are comfortable with.
2004.5 Silverado 3500 SRW 4x4, D/A (LLY), Ext. Cab, Long Bed
engineer837 aux rad, TxC CAI, LBZ MP, Scangauge II, Nicktane aux filter head, KD lift pump, 2008 PS pump, 2011 hydroboost, Frederico Swaybars, Rancho 9000XL, Torklift StableLoads, BFG AT/KO2, Lance 835 Camper often in the bed.
Last edited by jake111; 12-15-2019 at 09:38 PM.