'99 TJ Front Axle Swap

Plan on removing the stock low pinion 30 with 3.07 and swapping in a high pinion 30 with 3.54 from an XJ. Will be re-gearing front to a 3.73 at same time to match rear-end re-gear to 3.73

Will I need a new carrier for front axle?

What other challenges are ahead?

Yes.