monstor bash

I have a aftershcok that I am changing the clutch bell housing to the lst housing so i can change gear ratio. Some of the gears say to use a certian size spur gear with them. If i use my stock 70and 63 tooth spurs will it hurt my engine. what results can i expect from useing the 22 and 23 tooth pinions for the high speed? also I would like to get better turning and was looking into changing the oil in the diffs. what changes can i do here

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if it still helps, the bell shouldnt hurt the engine......... and 10,000 wt. oil in the diffs for front and rear is about right