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new differential case needed?

311 Views 2 Replies 2 Participants Last post by  Dirt Dog, 
G
I plan on changing the gear ratios in my dana 30 and amc 20 from 2.73s to 4.10s. Will I have to buy new differential cases to go to these new gears or can I do without these? They are pretty expensive, and I don't understand why some companies say that only 2.73 geared axles need to change the differential case. Thanks.
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ricochet
Yes you will need to buy new ones. unless you throw a detroit in the rear.
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