Transmission Flush or Transmission Drain/Replace? - Toyota Prius Forum : Prius Online Toyota Forums
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post #1 of 16 (permalink) Old 12-15-2006, 06:46 PM Thread Starter
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Default Transmission Flush or Transmission Drain/Replace?

Whats the difference between a transmission flush and a transmission drain/replace on the Prius? I've heard of people getting their transmission fluid changed out around 60k miles and am trying to look into it.. but don't know what I should be getting?

- Phish Phood, Los Angeles, California
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post #2 of 16 (permalink) Old 12-15-2006, 06:56 PM
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A transmission flush is only worthwhile with automatic transmissions with torque converters and cooling lines to the radiator. That's because if you just simply drain the transmission, you're only removing 50% or so of the total system capacity. With the Prius, the majority of the fluid would be replaced with a drain and refill since there is no torque converter or lines to worry about!
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post #3 of 16 (permalink) Old 12-16-2006, 09:43 AM
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Also automatic transmissions have little 'tunnels', valves and actuators that also contain transmission fluid, that often doesn't get completely removed. A flush also often uses cleaners to remove sludge and deposits still remaining in the transmission.

The purpose of the fluid in the Prius is simply to cool and lubricate. It has no responsibility for hydraulic controls like in a conventional AT. Draining the Prius AT is akin to changing the oil in your engine. Stuff comes out at the bottom, new stuff is added at the top (side actually), with few horizontal surfaces to trap and maintain the old stuff.
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post #4 of 16 (permalink) Old 12-16-2006, 06:04 PM
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Default transmission juices

Listen to DanMan. Fluid flushes are some sort of evil dealer profit center in the case of Prius.

But meanwhile, fluid analyses have not been altogether yummy clean from Prius transmissions. A few of them have failed, and we don't know why. It would seem reasonable to drain and refill the type WS fluid every 60 k miles, even though not (yet) specified by Toyota. I appreciate that this might be overkill, but it will only add about 0.2 cents per mile to your total operating costs. You could save that amount by doing your own engine and cabin air filters. Let's spend our Prius-maintenance-pennies effectively.

DAS
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post #5 of 16 (permalink) Old 02-07-2007, 05:25 PM
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Default Re: transmission juices

Quote:
Originally Posted by tochatihu
Listen to DanMan. Fluid flushes are some sort of evil dealer profit center in the case of Prius.

But meanwhile, fluid analyses have not been altogether yummy clean from Prius transmissions. A few of them have failed, and we don't know why. It would seem reasonable to drain and refill the type WS fluid every 60 k miles, even though not (yet) specified by Toyota. I appreciate that this might be overkill, but it will only add about 0.2 cents per mile to your total operating costs. You could save that amount by doing your own engine and cabin air filters. Let's spend our Prius-maintenance-pennies effectively.

DAS
Interesting.

I'm curious, are there any signs of impending PSD failure? And, what happens (internally) when it does fail?

Also, is there slippage or some other sort of empirical evidence? And does spent fluid get that burned smell as in a conventional AT?
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post #6 of 16 (permalink) Old 02-07-2007, 11:42 PM
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It's all gears that mesh together. If gears are breaking, they crunch. I doubt you'd see any slippage. It either works or it doesn't, much like a manual transmission (assuming you have no problems with the clutch)
The Prius has no clutch, no hydraulic shifters, no torque converter using hydraulic viscosity to achieve engine to tranny coupling.
There is a silent chain that is supposed to last indefinitely. I suppose that might be able to slip.

A few Prius Classics had PSDs fail, but I haven't heard any HSDs have the PSD fail.
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post #7 of 16 (permalink) Old 02-08-2007, 11:53 AM
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Default new model HSD failure

Hi Danman, I could only find one of these in my (perhaps incomplete) list:

2004 Prius, "scottinmsn", yahoo toyota-prius group messages #79283 and 79343.

DAS
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post #8 of 16 (permalink) Old 02-08-2007, 01:52 PM
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Dan, can an owner do the drain and refill? Or does it require the friggin' THHT to set some mode like the brake system fluid replacement requires? I don't mind doing it if I can, but I would think twice before spending $1-200 for the dealer to do it.

2005 Seaside Pearl, BC#6
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post #9 of 16 (permalink) Old 02-09-2007, 12:24 AM
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What do you mean, DAS?

KTPhil, anyone can drain it. I think it requires an allen key (hex) driver though to get the plug off. I think John has an article on it.

Just checked John's site. If it's there, I am not seeing it. He has an article on changing the engine oil though.
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post #10 of 16 (permalink) Old 02-28-2007, 11:05 AM
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Default yea

anyone can change it if u can find some lovely ATF WS, its a 18 mm bolt i think, or 22 mm not sure, but drain it and fill it through the one on the side of the trans. Dont trust me on this, im the guy that drove hte prius without proper lubrication of the transaxle

My toyota fleet, 01 prius,05 prius, 06 tacoma, 04 scion xa
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