How to change the Transmission Oil on a 2003 Toyota Sienna LE.
WHAT YOU’LL NEED
1) 4.75 Quarts of Dextron II or III automatic transmission oil.
2) Jack stands
3) Jack (I used my bottle jack from my 4runner)
4) Transmission oil filter (Optional: Toyota filters are not paper, but a wire mesh. Therefore Toyota says their filter doesn’t need to be replaced, just cleaned out, but I decided to go ahead and change it anyway considering that it’s not very expensive.)
5) Transmission pan gasket (This came with my Transmission oil filter kit)
6) 10 mm hex socket
7) 10 mm socket with 4” extension
1. Set the E-brake (Located on the left side of the floor board. The 03 Sienna has a double kick e-brake. Step on it to set and step on it again to disengage.)
2. Set the vehicle on jack stands or blocks.
4. Make sure you use the correct fluid type.
8. Using a hammer, I gently tapped the corners of the trans pan to loosen the seal.
11. Remove the rest of the tranny pan bolts and drain any remaining oil. (Note: Be sure to note the position of the three magnets on the inside of the trans pan. After cleaning the pan, you’ll need to place the magnets in the similar position.)
15. Replace the transmission pan with the new gasket in place. I simply used the transmission pan bolts to hold the gasket in place. Alternate sides when installing and tightening the trans pan bolts. (Be careful not to over tighten the bolts. I learned this lesson the hard way by breaking one of them off.)
16. Add about 2 quarts of fluid. Then making sure that the vehicle’s e-brake is set, and the front wheels are sufficiently clear from the ground on jack stands, turn the engine on and then go through all the gears from park (P), reverse (R), Neutral (N), Drive (D), Second (2), and Low (L), then move up through each gear till you get to park (2, D, N, R, P).
17. Add the remainder of the fluid and then turn the car on again while it is up on jack stands, and the e-brake is set. P, R, N, D, 2, L then up 2, D, N, R, P.
That’s it. You’re done!