Step 1: Gather your tools.
You will need:
- Jack and Axle stands or tire ramps to get your car off the ground
- Set of wrenches and ratchet set (depending on your vehicle.)
- Torque wrench
- oil drain bucket of some type
- Fluid pump
- WD - 40 or a penetrating oil
- Gear oil (most likely 75-90 or 80-90, check your owners manual)
Step 2: Locate and remove the "filler bolt"
Next we will locate and remove the filler bolt. In some cases the filler bolt will become completely siezed that heating it won't even work. Or the filler bolt may become stripped. If this happens to you, you don't want to this to happen with an empty transmission.
In the first image we see the bottom of the transmission looking up. The recessed bolt on the bottom is the drain. The square head on the side is the filler.
Loosen the filler by selecting the proper wrench (not an adjustable one!) and turn the wrench counter clockwise. If the bolt doesn't let go; spray the wd-40 on the bolt and let sit for 1 hour. Still stuck. Don't force it too much as it may break. You can use a propane, or MPS gas torch to heat the housing around the bolt and then gently apply pressure to loosen it. In the picture you can see I used the wd-40
If the bolt still won't budge. Stop. Lower the car and visit a shop for service in rare cases the transmission must be removed and taken to a machine shop.
If you get the bolt loose. Unscrew it, but don't remove it completely.
Step 3: Remove the drain bolt.
Loosen the drain, place the drain pan under the transmission and then remove the drain bolt allowing the oil to drain.
Step 4: Clean the magnet and remove the filler bolt.
Now remove the filler bolt. (you waited until now to keep the oil from draining too quickly and splashing all over.
Step 5: Replace the Drain bolt.
Step 6: Fill the oil. Close the filler bolt.
replace the filler bolt once again turning it by hand for a few revolutions. then tighten it and torque it using a torque wrench.