Differential System: Precaution

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 installation.
When removing a connected part made of light alloy such as a differential carrier cover, tap it off with a plastic 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 Toyota genuine differential gear oil LT 75W-85 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 non-residue solvent.
Coat sliding surfaces and rotating parts with Toyota genuine differential gear oil LT 75W-85 GL-5.
When holding a part in a vise, be sure to place an aluminum sheet between the part and vise. Do not put the part directly in the vise.
Do not damage the contact surfaces of the case. Such damage may cause oil leakage.
Do not fill the differential with oil immediately after parts have been installed using sealant. Allow at least one hour for the sealant to dry before filling the differential.
Damage to surfaces in contact with an oil seal, CD-ring or gasket may cause oil leakage.
When press-fitting an oil seal, do not damage the oil seal lip or outside periphery.
When replacing a bearing, replace the inner and outer races as a set.