while you are at working on the front and rear gears, you should change axel shafts as well. as you said, you only need to pay for the parts and install labor is $0. i did mine, it was great. at the same time they changed to custom drive shafts front and rear. you WANNA limit the chances...
I plan to re gear my stock 4.10 axels on Rubicon JL to 4.88 .
When it's being done, should I change stock axel shafts to chromoly ones? I run 37's now, regular 3.6L V6, auto 8speed tranny, Dana 44. Or stock axel shafts will do just fine.