Before starting this project you might want to give a watch to Timmy the Toolman's video about replacing these seals
Although used on all Toyota IFS, on the 3rd Gen 4Runner there is a known issue with the needle bearings where the spline shaft rides. Its a good time to either replace these with new OEM or better yet, replace with a clamshell bushing. You can get the removal tool and install tool as well as the bushing from East Coast Gear Supply.
Works with these front differential seals:
Driver side 90311-47027
Passenger side 90311-47013
Will work with any basic seal driver handle, the longer the better
This tool will work on the following Toyota/LEXUS 4WD IFS trucks:
4Runner 4WD (1996 - 2020)
FJ Cruiser 4WD (2007 - 2014)
Land Cruiser (1998 - 2020)
Sequoia 4WD (2001 - 2020)
Tacoma 4WD (1995 - 2020)
Tundra 4WD (2000 - 2020)
Lexus GX460(2010-2021)
Lexus GX470 (2003-2009)
Lexus LX470 (1998-2007)
LexusLX570 (2008-2021)