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First off, welcome to the board. Sometimes there isn't much traffic on here on the weekends.
Not much available for the Eaton's as far as the gears go. The 4.10's are about as high as they go. The 700r4 would probably be your best bet. Here is some reading on it while you are waiting on other members to chime in with their experiences....
http://67-72chevytrucks.com/vboard/s...ad.php?t=33266
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