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Discussion Starter · #1 ·
i've got a good one here. When you change the rear axle gear in 2001 astro from 3:42 to 3:73 does the computer have to be reprogramed to accept this new ratio? and how do i get the smiles to work?
 

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Yes, not getting that computer reprogrammed will affect many systems included your speedometer and shift points.

Which smiles are you talking about?
 
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