I've got an open rear-end too (7.5", 3.73) but I was thinking about keeping it and getting a powertrax no-slip. Its automatic locking rear-end reviews say it locks good and you just have to change driving style a little. So it will provide you with more traction when the l/s won't do what you need.

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current - 2001 2.5 5spd 3.73 XLT reg cab short box 165K
dead - 2001 2.3 5spd 3.73 XLT reg cab short box 70K