Automatic Transmission: Precautions

Wear working clothing, including a cap, protective goggles and protective shoes during operation.
Remove contamination including dirt and corrosion before removal, installation, and disassembly.
Keep the disassembled parts in order and protect them from dust or dirt.
Do not place the oil pan with its inner side facing upward until it is installed so as to prevent foreign matter intrusion into valve body.
Before removal, installation or disassembly, be sure to clarify the failure. Avoid unnecessary removal, installation, disassembly and replacement.
When disassembling the case and other light alloy parts, use a plastic hammer to open. Do not pry it apart with a screwdriver or other tool.
Be careful not to burn yourself, because each part on the vehicle is hot after running.
Use genuine gear oil, grease etc. or the equivalent. Do not mix gear oil, grease etc. with that of another grade or from other manufacturers.
Be sure to tighten fasteners including bolts and nuts to the specified torque.
Place shop jacks or rigid racks at the specified points.
Apply ATF or gear oil onto sliding or revolution surfaces before installation in view of components usage.
Replace deformed or otherwise damaged snap rings with new ones.
Before installing O-rings or oil seals, apply sufficient amount of ATF to avoid damage and deformation.
Be careful not to incorrectly install or fail to install O-rings, snap rings and other such parts.
Before securing a part on a vise, place cushioning material such as wood blocks, aluminum plate, or shop cloth between the part and the vise.
Avoid damaging the mating surface of the case.
Before applying liquid gasket, completely remove the old seal.