In 1994 Suzuki upgraded the output shaft and stopped using the older style shaft that was prone to failure.
These newer style shafts are a drop in replacement for all 86-93 transfer cases. This upgrade is good for transfer cases that have aftermarket gears like Petroworks GRS 4.89 gears.
This gear can be installed without full dis-assembly of the transfer case. Only the front output cover needs to be removed.
These are FACTORY MADE JAPANESE parts, not cheap Chinese reproductions.