I have 37s, and I regeared my gladiator to 4.88s with my own two hands. (Never doing that again) I made a thread about the install with my feedback. To this day, I got better mileage with my 4.10s I think, but realistically that doesn’t make much sense and is likely the change in 37s (milestar to baja boss) You’ll be perfectly fine with 4.10s …

https://www.jeepgladiatorforum.com/forum/threads/35s-vs-37s.87079/page-2