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It's not hard to do, but requires special tools and a great deal of knowledge (and/or experience). You'll need an install kit to properly 'set up' the gears. Many variations of kits exist, the biggest difference is whether or not the come with new bearings. Let the condition of your bearings or mileage be the deciding factor on replacing bearings. Some will tell you to just replace the bearings anyway - I suppose there is some merit to that. The gear set you'll need is from any 10 bolt 7.5 inch rear. GM put out millions of them. Do a search for GM 10 bolt 7.5 or 7.625 and you'll see the car that had them. Also, there are two different series carriers one for 3.23:1 gars and numeriaclly lower, and another series for 3.42:1 and up.

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Q: Change rear end gears on 1987 montecarlo ls?
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