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Are you asking how much it will cost to buy it and have it professionally installed?
OR
Are you asking how much it will change your elapsed time? 0-60 time? etc
Mine is $ 550.00 in the for sale section. Yes, it is worth it. Even if you tear it apart or freshen it up with new bearings.
This is a great deal. Jump on it!
Anything less than the core charge for a stock differential, which is $600, is a steal. I paid over $2000 for my stage 2 differential from DTE, including the upgraded pinion support.
Buying a used 4.10 diff is risky business. I bought one used and got burned. I learned the hard way that you will be less likely to have problems if you buy a unit from a reputable source rather than to gamble on a mod like this. Keep in mind that you will pay between $300 to $800 to have the diff swaped out. Now imagine paying that twice because the used one was bad.