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Message: [QUOTE="08psdbeast, post: 84442, member: 1766"] Check the backlash before removing the old diff. Keep track of the location of the spacers. Check the backlash after installing the locker. If there is a difference and the backlash is no longer within the manufacturer's specs then you will need to re-shim. If it is the same or different but still within specs then you should be OK. You should always check the contact pattern even if you don't have to re-shim. It might not have been correct to begin with. Just sayin. The contact pattern should be oval/elliptical and in the very center of the ring gear tooth. I've seen factory diffs that were so far out they howled going down the road. If you've never done one before I would plan on it taking most of a weekend. I used to know a guy that could do one correctly in about 3 1/2 hours. My best was about 8 hours but that was a long time ago. Good luck. [/QUOTE]

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