My son has a 2000 wrangler with 2.5 4cyl manual trans with 4.11 gears, my daughter has a 2004 wrangler with 2.4 4cyl auto trans and 4.56 gears. I was thinking about doing a gear swap since he wants bigger tires and wants to go off roading and she doesn't. Is there any concerns i should have. The spec sheets say the rear ends are the same.