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So I don't know if we're talking orion or simply gear ratios, but....
I have always thought the SM420 plus stock transfer rocks in FJ40's. The approximately 75:1 is the sweet spot for the Rubicon. But last year I did Fordyce creek for the first time, and honestly, lower gears would have been nice.While 300:1 might be overkill, 120:1 would be OK. It is very nice to go slow with the motor in it's sweet spot around 1800 RPM. I found myself having to lug the motor down to 400 rpm and that was too fast.
I think that an FJ40 at 120:1 would be perfect, so an h41 with Orion would let you do whatever you want. An SM420 with Orion is very low, but OK.
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Andrew
1971 FJ-40 Rubicon tested, 2F powered, SM420, some mods
1976 FJ40 Rusting slowly in the back yard
1984 FJ-60 H41, Toybox, 4.11, SOA, twin sticks and more
1989 FJ-62 125k-Stock, daily driver
1997 FZJ-80 Driveway queen, with door dent
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