if you are regearing there is not reason not to move to an hp30.
and ftr, the carrier break is 3.55/3.73. the vast majority of XJ hp30 are 3.55.
the YJ also and an HP30 and gears from those can be found in 4.10 very easily. any other gears are aftermarket
'98 ZJ on 37s and tons
'02 Chevy 2500HD 8.1