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is there a difference in strength between rear ends from a 2.8 and a 4.3? i tried searching but couldn't find anything. thanks for any help.
 

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9 times out of 10 they are the same. Some of the 4.3s received the 8.5" differential over the typical 7 5/8". Mostly 4x4s and manual trans 4.3s.

But more than likely, if you have a 2.8 or a 4.3, you got the 7 5/8 ring gear small 10 bolt.
 

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Only difference between the 7.5 and the 7 5/8 are the axles. 26 vs 28 spline I believe, the carriers are interchangeble, but you also need to make sure they have the same spline count.
 
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