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Unread 09-15-2009, 12:11 PM   #1
acolon
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AMC 4.10 Gear installation.. Help!!

I want to change from 3.31 to 4.10 on Amc 20 wide track installed in a CJ7. Does I have to change the differential case?
Thanks for your help.

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Unread 09-15-2009, 12:21 PM   #2
80cj
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No. On an AMC 20 3.07 and higher numerical ratios (up to 4.88) use the same case.
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Unread 09-15-2009, 12:27 PM   #3
Redmanchew
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however, if that is the same gear your running in the front axle, then yes i believe that you have to change the carrier to go from 3.31 to 4.10's. i'm in this same boat with my 3.54's
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To reiterate for the 1,067th time, when towing...
remove rear axle, xfer in N, trans in 5th, remove neg batt cable, key to Run and go??
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Unread 09-15-2009, 12:40 PM   #4
acolon
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I want to change the gear ratio in the front to 4.10 also that is a Dana 30. Here I believe that I have no choice I have to change the diff case.
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Unread 09-15-2009, 12:46 PM   #5
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Quote:
Originally Posted by acolon View Post
I want to change the gear ratio in the front to 4.10 also that is a Dana 30. Here I believe that I have no choice I have to change the diff case.
For a Dana 30, the ratio split is 3.54 and down, 3.73 and up. If you have 3.54's you'll need to get a 3.73 diff case.
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