92-93 Montero came with 4.875. You would definitely have to change your gears. Good luck finding those years SR with rear locker. 4.636 v 4.625 is absolutely negligible. It equates to approximately 0.08ö difference between front and rear tires on truck equipped with 31ö tires. Anyone over here with so perfectly worn tires. I doubt that.

92 SR, 285/75R16 Yoko MT ARB locker GAST compressor AirLift 1000 MM10500 Snorkel custom rear bumper
02 Montero LS died protecting the master
08 PowerWagon (stock!)