How to Change Your Transmission Fluid

Look at the photo on Mendel's comment #122 How to Change Your Transmission Fluid | Page 7 | PriusChat
No4 clip (90467-07166 Plastic & Plastic Clips) is listed as one that need to come off. I am not sure if you really need to buy that one or you can just re-use one since it is a plastic to plastic type of fastener.

 

Yeah, regularly taking off the whole panel, I pay no attention to #4 style fastener. It's connecting the "flap" to adjacent plastic. If it's intact it'll stay that way, it's just along for the ride. If on the other hand you're using the flap regularly, then it may be damaged or gone.

My Amayama order came yesterday. I opted to get a complete replacement set, (11)-#3 and (2)-#5. I'll probably replace both #5's next time; the ones I have are "functional", but the heads fall right out every time. With the #3's there's maybe three existing ones missing a jaw, guess I'll just replace those. I'm thinking to put silver sharpie pen mark on all the new ones, so it's easier to keep track of which are replaced.

 

I took both clips out of package, and they appear to be real McCoy. I'm liking Amayama; there's near-zero options for Toyota products from North American retailers if you're in Canada, and their prices are good. You want to be a little "strategic" in you orders, try to get everything from one country (easily done, they show the optional sources), to avoid multiple shipping packets.

I should have wised up a little, let the cart build up a bit more, say wiper blade inserts for example, and the shipping would likely have been about the same. Anyway:



Note too: CDN $ is about 0.75 cents US.

 

Maybe. Personally, I would even use something like nylon license plate nuts/bolts; I never remove those plastic/plastic ones. They're readily available automotive item. I've used those on the rear wheel spats, the little rubber flaps at leading edge of rear wheel wells.

 

Yeah. The ones you have may be fine, something to keep in mind. The #4's are holding two edges of plastic, with a clamping piece that's 2" c/c of holes at most. Pretty trivial. Even a zip tie would do, forever or just temporary. The license plate nylon bolts are quite versatile, look good though.

 

Typo. Most transmission oil changes are done by professional shops, and not home mechanics.

 

This is the correct one:
On one Toyota website, this seems to be the one I need to get:
2010 Toyota Prius Hatchback HYBRID Plug; plug sub-assembly. Hsg, overflow - 9034118016 | Stevens Creek Toyota, San Jose CA

This is for automatic transmission, not CVT:
You don't want this one.
Another website, still official Toyota website, cannot verify that this is the part I need:
2010 Toyota Prius Plug. Drain. Transmission. Automatic. Pan. Liter, maintenance - 9034118016 | Venice Toyota, Venice FL
You could try some valve grinding compound. Put some in the stripped out area and on the 10mm hex.
Tap it in with a small hammer, When you get it in far enough, you can start up loosen it as you continue to tap on it.
Or use a hammer and chisel.

 

Don’t remove the drain plug until you remove the fill plug. If the fill plug is stripped, you want to know before you drain all the transmission fluid.

 

Appears that whoever changed the ATF before your attempt must have not level the car during the drain & refill.

 

I clicked on the links you provided. I didn't notice the part numbers....
2 different sites show 2 different things....

And you are saying the drain plug just turns? Doesn't back out?
I thought the hex was stripped. They/you are probably going to have put a heli-coil in it.
Depending on what is stripped, the bolt or case, or both.

 

Okay, I figured that's what you meant originally. Try the valve grinding compound. I've used that trick
several time with success. Depending on how loose it is. If it's completely rounded, it might not work
because there is nothing to make contact with. Might be hammer and chisel time.

You could put a hose inside from the filler neck and syphon it out. You probably can't get all of the fluid out,
but most of it.