I just found out the filter is on a national back order, is it a good idea to use an aftermarket filter from auto zone?

I personally won't go to autozone anymore because they SUCK and they've sold me too many wrong parts (including the wrong tranny filter among dozens of other wrong parts thoughout the years). Go to O'reilly, Napa or just about anyone else. You could also just clean your stock filter with brake cleaner and re-use it.

I flushed the ATF, and it changes gears better than ever. Thanks to everyone for all the advice!

Reviving this thread, looking for some double checking of what was said here a while ago.

Over the weekend I replaced the timing belt and radiator. Lost about 1.5-2 quarts of tranny fluid when I drained the radiator. I was at the Toyota dealer to get red coolant and decided to pick up tranny fluid too, to top off what was lost. I have a 1999 Limited 2wd Automatic, they told me that I needed T-IV. Went to top it off today, and didn't think to check if it was indeed the correct fluid until after I already did it (stupid I know, but it has been a long weekend and I just wanted to get it done). I need to drive this tomorrow for work and may not have time to do a transmission flush for a couple weeks.

My question is in practice how incompatible are T-IV and Dex II/III at this quantity, and will I be fine putting like a hundred easy miles on it without doing any damage?

Doesn't the bottle tell which vehicles it's not compatable with?

I know the TAAT auto in the Saturn is on that list.


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T-I, T-II, T-III and T-IV are backwards compatible with Dex III, you should be fine.

I switched to Valvoline MaxLife DEX/MERC (was cheaper than Mobil 1) which in the fine print says Toyota Type T-I, TIII and T-IV compatible, and so do lots of other ATFs out there today.

Harvested from the internet
There are internet references to a TSB referencing T-IV as the preferred fluid for many other Toyota cars that initially called for DEX II/III like our dipsticks do. I wouldn't lose sleep over it.

@octanejunkie

Thanks, that's what I thought I just wanted to triple check before I put some miles on the truck. Have had it in the garage doing bunch of work (timing belt, water pump, radiator...) and need it operational for my job like yesterday.

Much appreciated.

This title is a typo and is referring to Dex 6 (VI) correct?


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Nope

The OP is dated 2010 lol

Necro bump af

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Yea, I found a reference to Dex 4 but was under the impression that it was only ever available from the dealer and only for a short period of time before Dex 6 came out.

My friend that runs the parts department at a local GM dealer and a avid Toyota owner says that Dex 6 is indeed good for the A340 trans.


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Thanks for double checking this, I got nervous for a minute because I've been running Dex III since replacing the transmission last year and I had a slip in 1st gear taking off from a red light today. Still not sure what the slip was all about but I can rest easier about the fluid type now.

I think I'll flush out the Dex III and put in the Type IV as a precaution and maybe throw in a quart of Lucas Fix, I have both in the garage on the shelf may as well use it.

There is no IV Dex anymore. It's now Dex 6.


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This is what I meant by Type IV...it's the Toyota stuff not the Dexron

https://www.amazon.com/Genuine-Toyot...smission+fluid

I didn't realize Dexron what up to a type 6 now, III seems to be what I always see on the parts store shelves

Got yea, my bag.


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