[thatbluefourtrax]

I'm looking to put the tallest tire size I can put on my 420 4x4 with out having to do a gear reduction.


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[SamUK]

26" is the biggest you can go without a GR.

 

[thatbluefourtrax]

And I'm looking to do like a very skinny set up like a 8 inch wide tire


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[SamUK]

either way you still going to notice power loss over a 26" going skinny doesn't change anything as it's the diameter that matters. What going for skinnies does mean is you can go for a more aggressive tread pattern.
Just remember, skinnies dig down well, don't go ridiculously aggressive as you'll end up not being able to spin the tyres in holes to clear the tread.

My opinion, go for mudlites or something similar.