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does anyone make a 4r70w with a higher fourth gear ratio. I want lower rpms in fourth gear when combined with 4:10s or 4:30s. i think stock is 070 right?
 

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automatic transmissions don't work that way. They have a planetary gearset so you can't change one gear without changing all the others too. And as far as I know, the only other gearset you could use would be the AOD, which has a .67 top gear instead of a .70, but first and second in the 4R70 are much steeper, so you would lose a lot of acceleration doing that, all for practically nothing on top end.
 
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