31/10.50 do make a difference to the 30/9.50's. Doesn't sound like much, but side by side, you can tell..Good luck.
Nothing to it but to do it.
SIMPLE AS THAT.
'01 TJ Sport, 4.0l 5sp man.
2"BDS coils,Bilstein 5100's, 32/11.50/15 Falken Wildpeak AT's yellowed out, on Black steel D's.