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Old 04-23-2010, 08:44 AM #1
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Unhappy HELP - Accidentally added T-IV to Dexron III

I just bought a 96 4runner with 178K Miles. Tranny works great. I decided to change the ATF.

I dropped the plug 3 times and added T-IV (so far added about 9 quarts of T-IV), I just found out that I can't mix T-IV with Dexron III which the vehicle came with. I've driven about 500 miles with the mixed oil already...

Should I drop plug a few times again and add Dexron III or should I flush it with Dexron III, (as much as I hate flushing, with all the horror stories I've heard about flusing...)? Also, will my tranny be ok or have I pretty much killed it half way already?

Please help!

Last edited by staghv1; 04-23-2010 at 08:51 AM.
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Old 04-23-2010, 09:44 AM #2
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I doubt you did any damage at all but I'm not an expert on any automotive fluids. You can flush it yourself using a bucket and the trans cooler send line at the radiator. If it were mine, I would get the right fluid in there unless I could find solid data proving that the T IV is compatible or better. I found this which I thought was interesting
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Old 04-23-2010, 10:31 AM #3
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Quote:
Originally Posted by 004Gunner View Post
You can flush it yourself using a bucket and the trans cooler send line at the radiator.
Have you used this method yourself? Are you saying you can idle the engine, pump out the old fluid and the tranny will suck the proper amount with the return line in a bucket of new fluid?
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Old 04-23-2010, 11:20 AM #4
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Quote:
Originally Posted by BTO View Post
Have you used this method yourself? Are you saying you can idle the engine, pump out the old fluid and the tranny will suck the proper amount with the return line in a bucket of new fluid?

No, I doubt it would suck the correct amount at the correct rate, since you lose the pressure of the system by opening it up. But you can still do it, you just let it pump out about a quart at a time, then stop and pour in a new quart through the dipstick.


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Step 39: Flush The Transmission
This is a two man job; get a friend to perform the starting and stopping of the rig, while you monitor the amount of ATF coming out of the drain line. Start the rig, this will start the flow of ATF out of the hose at a rate of about (1) quart per 22 seconds. Let your bucket fill up (1) quart and then turn off the rig; you might be able to go (2) quarts, but I played it safe and went (1) quart at a time. Add a quart of fluid through the dipstick tube. Repeat this process until new ATF is coming out of the drain line, a white bucket will help you determine when the ATF color changes; my orange bucket didn't do so good. If you can't tell the color difference, just make sure you go through about (16) quarts of new fluid (refilling of the pan and the flush).
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Old 04-23-2010, 11:32 AM #5
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unfortunately type T will make the tranny slip and shift funny i had a customer long time ago do this to his taco.
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Old 04-23-2010, 12:25 PM #6
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Quote:
Originally Posted by SIKHILUXSURF View Post
unfortunately type T will make the tranny slip and shift funny i had a customer long time ago do this to his taco.
So if I drop the plug a few times and dilute the oil with Dexron III, do you think I may be ok after lets say 12 quarts? Or should I consider flush? Thanks.
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Old 04-23-2010, 12:46 PM #7
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Quote:
Originally Posted by staghv1 View Post
So if I drop the plug a few times and dilute the oil with Dexron III, do you think I may be ok after lets say 12 quarts? Or should I consider flush? Thanks.
i would presume so as they guy with the taco drove it like that for 15k before we swaped tranny fluid.
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Old 04-23-2010, 01:35 PM #8
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Quote:
Originally Posted by staghv1 View Post
So if I drop the plug a few times and dilute the oil with Dexron III, do you think I may be ok after lets say 12 quarts? Or should I consider flush? Thanks.
Consider the flush. Better yet, do the flush. I absolutely would. And IMO and experience the MYTH that flushing will destroy your tranny is horse sh!t. That's only true if the tranny is on the verge of breaking before you flush it. There would be no question whether to flush or not if it were mine. Actually I did a complete flush at 185K and it's never shifted smoother. Here's the write-up: Dropping Pan And Flushing Transmission
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Old 04-23-2010, 02:29 PM #9
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Quote:
Originally Posted by SIKHILUXSURF View Post
i would presume so as they guy with the taco drove it like that for 15k before we swaped tranny fluid.
Did it actually take 15K miles on the new fluid for the tranny to slip? And once he changed the fluid, did it help the slip?
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Old 04-23-2010, 04:11 PM #10
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Quote:
Originally Posted by staghv1 View Post
Did it actually take 15K miles on the new fluid for the tranny to slip? And once he changed the fluid, did it help the slip?
well im not to sure he brought it in to the dealer when it started to slip and shift really bad. it was done by a mom and pop shop so we told him to go back to the place he got it done at.
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Old 04-23-2010, 07:56 PM #11
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Why is it that Valvoline Maxlife ATF (Which I added when I did a D&F) is compatible with Dex III and T-IV?

Valvoline.com > Products > Automatic Transmission Products > Automatic Transmission Fluid > MaxLife® DEX/MERC ATF

If you read under the overview it notes a lot of applications including Dex II and III and T-IV.
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Old 04-23-2010, 10:22 PM #12
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I am going to flush the tranny myself tomorrow, I bought Penzoil ATF that is compatible with Dexron II, I'm assuming Penzoil is probably a good brand. Any thoughts on Penzoil ATF? Thanks.
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Old 04-23-2010, 11:14 PM #13
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i honestly would only use toyota trans fluid.
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Old 04-23-2010, 11:19 PM #14
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its ok in fact T-IV is a better fluid, on my 2000 solara it takes dex III and i flushed it out for T-IV. I worked for toyota for years and we did it to all our cars. In fact toyota suggest you flush out and switch to T-IV.
the only tranny fluid you cant mess with is WS.
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Old 04-24-2010, 01:55 AM #15
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Quote:
Originally Posted by SIKHILUXSURF View Post
i honestly would only use toyota trans fluid.
Toyota doesn't make Dexron, it's a GM product and that's what Toyota chose to use and that's what they specify in the manual. Aisin developed the A340 trannies around Dexron, and the letters "D-II" are cast into the drain plug on the tranny. Take that as you will, but to me that means don't put fluid in there that's not Dexron II or higher (because all the higher #s of Dexron are backwards-compatible).
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