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As far as gearing, you take the low on the trans and multiply it by the low on the t-case & mulitiply it by the axle gears. With an auto, low gears are over rated, I ran 30:1 for years off road with my 700r4 and rarely did I ever need lower gears (I wheeled ALOT in some pretty rocky terrain). My brother has 70:1 in his fj40 with an sm420 and it definately needs lower gears. The main reason to do the crawler is that it only costs a little bit more than the straight adapter.
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