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i have a 2005 f350 with a 10 inch lift, 38'' mud grapplers and 20'' rockstars. i am going to size up to 40'' grapplers this winter. however would a 4.56 gear be the best to get me back around stock? i have 3.73 from factory. i would rather be a little lower than factory rather than being a little higher. but im afraid 4.88 would be too low. thanks for the help guys
 

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i think 4.56 will do i had them on my truck when it had 40s it seemed fine to me and i have them now with 38s
 

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Yep, 4.56 gears
 
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