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Rear Differential

  • Thread starter Thread starter pmwild
  • Start date Start date
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pmwild

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Looking to replace my stock gear with a 3.91 ratio. Will it bolt directly in if I buy it as a complete unit? I have a 1982 'vette
 
No, that one will not bolt to a 3 series posi case, like you have in the 82. You will need a series 4 carrier. The ring geear flange on the 4 is thicker and positioned more to the center. You can run larger gears on a 3 using a spacer but 3.91 is too large, even for that.
 

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