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Discussion Starter · #1 ·
I have a friend who has a old fire truck with 5:13 rear gears.

He wants to install a 700R4 for lower RPM's on the highway.

To determine the theoretical gear, is it as simple as multiplying 5:13 by .70? Or am I missing something.
 

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Premium Member
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That is how you'd do it but I do not think the 700r$ has a .700 fourth gear. I have a 2004R and it is supposed to be a .76 and if I remember correctly the 700 is just slightly less overdrive than that say about a .780 or .800 but I cannot remember exactly what it is.
 
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