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Discussion Starter #1 (Edited)
So, my 10 bolt series 2 rear with 2:73 ratio needs an upgrade. What posi unit can I use? What gear sets? Looking for 3:40 to 3:70 range
 

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You will need a new 3 series carrier to run those ratios. Call Quick Performance. I just upgraded my 8.2 10 bolt from a 2.56 open carrier to a 3.36 posi for under $600.
 

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Have you considered swapping in an 8.5 10 bolt? What kind of power are you making?

Deven
 

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You might try Gevo’s Rears and Gears, he has a web site.
 
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