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Mixing Transmission Fluid


Roley94

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  • Member For: 12y 10m 14d

You could try what I did to do a full trans flush. Don't know how to do a link but I called it 'Diy Zf Trans flush' in the driveline workshop. I basically removed the rear line out of the heat exchanger, inserted a peice of 12mm garden nylex hose into it and out to a 20L bucket. Had my 20L drum of GW Syntrans with a tubeless tyre valve inserted and a hose out the lid to the fill point on the trans, started the car, and used my air compressor to pressurise the oil drum forcing new fluid into the trans as it was pumped out the old fluid via the heat exchanger line. Took 17 odd litres before the fluid was completely changed. The advantage is that it pumps all the Lifeguard out of the converter, replacing it fully with Syntrans. It was pretty easy and I had the piece of mind of not mixing fluids. I kept the GW drum with the valve in it for next time. To get the correct level I just slightly overfilled, inserted a multimeter temp probe into the oil thru the filler hole and let it dribble out until I reached 40 degrees at which point I put the bung back in. Easy. Best to read it as I put more detail in it but no pictures sorry, I didn't think anyone would be interested at the time. Cheers.

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  • Member For: 14y 4m 3d

So are there issues to be had if a full flush isn't done first up? I'm looking at paying $160 for 8L of transmax Z with my tuner as part of a service but with the GW stuff being $250 maybe a full flush should be done? That'll increase my labour quite significantly though won't it?

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  • Member For: 16y 2m 14d
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  • Location: CQ

When I first did my bf I mixed fluids, I dropped the genuine fluid and added transmax z drove it gently for a week probably 50km gave it a chance to fully mix then dropped it the following week and added more transmax and that box is still going strong with the new owner. However I was young and dumb and I certainly wouldn't so it like that again... Leetho's method sounds unreal, would it suck up the new gw without pressurizing the drum?

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  • ...JD TUNING ADELAIDE...
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  • Member For: 16y 8m 22d
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  • Location: Adelaide

It might but the auto pump would be sucking like crazy to do it, so giving it a helping hand with air is a good idea

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  • Member For: 12y 10m 14d

I don't think it would suck it up as the hose was just inserted firmly into the fill hole so not sealed and I am not sure it could create that much vacuum. The tubeless tyre valve was free down at the tyre shop, pop that into the top of the drum and use your tyre inflator and compressor to pressurise it. I sort of blipped the air on and off to keep the pressure right to equal what was being pumped out. Anyone could do this as I am not even a mechanics ass. The GW cost me NZ$250 for 20L so is cheap enough to do yourself on a regular basis if the car gets driven hard. Ford wanted to charge me NZ$75 plus 15% gst per liter just for the fluid, another $400 odd for the pan and more for labour and flushing machine. $2000 odd, ahhh - Nope.

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