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Yeah the track lock uses clutches to keep both wheels spinning at the same speed but still allows some slip so you can corner without chirping the tires, those clutches will wear out and need replaced eventually. There is also gear driven limited slips like the Truetrac, no clutches to wear out but they also cost more.
Yep. Cost and function did play a role in why I chose the Spicer. I know that clutches don't last forever, but rebuild kits are relatively cheap plus with mostly highway driving the clutches should last me 50-100,000 miles. I did use Mobil1 Synthetic LSD oil and it seems to function well without additional additives.