I think you need to take a breath and revisit why you put this question up here.
It wasnt to run 35" tires or larger...
It wasnt to run the Rubicon or Moab.
You weren't conplaining of a traction problem on the trail...
From what I gathered your issue is just a lack of power running 32's on the paved hills of North Carolina.
In other words you're looking for sonething to help maintain your road speed a bit better traveling the hilly terrain you reside in. No?
Have you looked at any gear charts? While they're not perfect because they don't factor in terrain and extra tire weight they will accurately show you the factual rpm. That's completely in lieu of terrain and extra weight.
MPH and RPM don't care about terrain and weight.
In your case you're not moving up in tire size so an added tire weight is null.
You are the only one that knows your terrain and if the rpm change will be enough to help you.
The below chart is running at 65 mph. These gear charts are all based on a 1:1 final drive ratio.
Your automatic would mean 3rd gear.
View attachment 256319
You're running approximately 2546 rpm at 65 mph. Not knowing your exact tire diameter it won't be exactly 2546 rpm but very close.
Again not knowing if you changed your speedo for running 32's over
29"ish stock tires's your speedo will be off a bit.
All that aside the facts remain your 3.73 gears and a true 32" tire will get you 2546 rpm at a true 65 m.p.h. with a 1:1 final drive.
You can just multiply this rpm by .69 and get your rpm in overdrive @65 mph
At present your rpm in overdrive @65 mph will be
at or near 1,750 rpm.
4.56 gears will put your rpm nearly 600 higher at 3112 rpm @65 mph with a 1:1 drive ratio (3rd gear)
In OD youll be at or near
2,148 rpm @65mph
Thats a nice improvement over what you have now.
4.88's in overdrive will get 2298 rpm @65
Weighing all things such as your initial goal here...
I think you'll find a very nice improvement over what you have now in the 4.56. Considering it's a nice upgrade for only $400 per axle.
Perhaps you show up with cash you can get it even cheaper.
Good luck in your endeavor