I did the 8.8 in my YJ. It withstood a goo bit of beating from 36" tires. As for gears, I would go ahead and do 4.56. As long as you keep something with overdrive, it will be fine for a DD and still be ok if you move to 35" or so.
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1988 Suzuki Samurai on propane
FJ 40 axles (4.10)
5.14 tcase
36" TSL SX
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