The comments about just needing new shafts to go 29 spline in the 8.25 are correct.
My 01 XJ has run over 300,000 miles on BFG A/T 235/75R15 with the stock axle gearing and I never considered changing the gear ratio.
When I installed lockers in my 97 XJ which runs BFG A/T 30x9" I went with 3.73 because I didn't want to buy a 3.55 locker for the front D30. On that Jeep going 4.10's may have been a better idea.
Incidentally, my 97 XJ came with the UpCountry package and it had 3.55 axles.
Both Jeeps are automatic transmission.
My 01 XJ has run over 300,000 miles on BFG A/T 235/75R15 with the stock axle gearing and I never considered changing the gear ratio.
When I installed lockers in my 97 XJ which runs BFG A/T 30x9" I went with 3.73 because I didn't want to buy a 3.55 locker for the front D30. On that Jeep going 4.10's may have been a better idea.
Incidentally, my 97 XJ came with the UpCountry package and it had 3.55 axles.
Both Jeeps are automatic transmission.