Solid Pinion Spacer
Solid pinion spacers prevent loosening of the gear setup preload. Originally designed for older Toyota applications, Toyota stopped using them decades ago. Solid spacer and shims replace the crush sleeve. It takes a little longer to set up but you won't have to keep retorque the pinion nut down the road.
Solid Spacer 4Cyl, 140059-1-KIT
Solid Spacer V6 & High Pinion, 140060-1-KIT
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov