It’s a big enough deal that every platform (GX, 4Runner, FJ) of that era talks about stripping the 8” ring gear teeth on their forums. Most of the big/well known Toyota driveline shops offer an upgraded rear axle (8.2, 9.5, D60) option for that platform, so there must be something to the phenomenon.
Toyota created the 8.2“ for a reason. The ring gear size barely increased in actual measurements, but apparently, the third member casting is much beefier to prevent the ring gear deflection that causes/contributes to the problem in the 8” differential. Adding a stronger (ARB and solid pinion spacer) differential doesn’t prevent the breakage either according to those who have upgraded and still stripped the teeth.
Jack
