I have 31's and a 4 inch lift on mine. I noticed a reduction in mpg and power when I went from the stock 29's to the 31's, and have not yet regeared. It is not a deal killer, but I think 4.10's would be helpful, especially when towing. I can't imagine going to 32's and not regearing. I would think you'd never be able to cruise in 4th gear unless you were going downhill, and it would put a lot of strain and wear on your transmission over time. For 32's, 4.10 gears would be minimal but 4.56 gears would be helpful if towing or if you live in a mountainous area.
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2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997