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How do I figure out what speedo gear I need?? Is their a reference sheet or something??
I went from a 3.21 to a 3.55 keeping the same tire size.

Olly
 

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Check the tech board, I just had a post with a formula in it.
 

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i guess i got lucky i went to 38.5s on dana 60s w/ 4:10s and somehow it ended up being almost exactly stock ratio whenever i go past one of those speed things that says the limit and displays how fast your going i try a different speed and so far my speedo seems to me dead on fast and slow
 

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I'm not that lucky, if I did my math right mine will be 4 mph slow because I couldn't go anything less than a 26 tooth gear because the 25 tooth wouldn't catch the gear in the t-case. Too small.
 
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