Differential System: Precaution

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

Before disassembly, clean the outside of the differential assembly and remove any sand or mud to prevent it from entering the inside of the assembly during disassembly and reassembly.
When removing a connected part made of light alloy such as a differential carrier cover, tap it off with a plastic-faced hammer. Do not attempt to pry it off with a screwdriver.
Always arrange disassembled parts in order and protect them from dust.
Before installation, thoroughly clean and dry each part and then apply hypoid gear oil API GL-5 to them. Do not use alkaline cleaner for aluminum or rubber parts and ring gear set bolts. Also, do not clean rubber parts such as O-rings or oil seals with a non-residue solvent.
Coat any sliding surfaces and rotating parts with hypoid gear oil API GL-5.
When holding a part with a vise, be sure to place an aluminum sheet between the part and vise. Do not put it directly in the vise.
Do not damage the contact surfaces of the case. Such damage may cause oil leakage.
Do not fill oil immediately after installing sealed parts. Wait at least an hour.
Damage to surfaces in contact with an oil seal, O-ring or gasket may cause oil leakage.
When press-fitting an oil seal, do not damage the lip of the oil seal or outside periphery.
When replacing a bearing, replace the inner and outer races as a set.