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Changing diff ratios


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I have a 4.11 diff thats tired and meeds rebuilding. However my car now has a 1500 with j type so would benefit from higher gearing. The slightly oversize tyres already raise the gearing by 9 percent. I am thinking about having a 389 but dont want to go to the trouble of changing all the existing good ujs. Can i get a diff rebuilt with the earlier output flanges but higher ratio gearing ?

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