Have been running Amsoil Synthetic ATF on my rigs, no issue.
That's two XJ's and a K10.

 

if it was rebuilt you can use dex III or you can use the +4. the trans shop I work at we use mercon 5 in everything except where it needs the new dex 6. Mercon 5 is a good all around universal synthetic fluid that works well

 

The aw4 is actually not a "toyota" design a similar trans is used in toyotas and lexus its just an aisin warner trans used in different vehicles and when a fsm says atf+4 use that non synthetic of course.

 

yeah ima just let the trans shop do there thing after all there the pros if i know how to work on transmissions i would do it myself lol

 

No wonder you have to change it every 15k...




So, Use your ATF4 if you want... Have fun spending another 2k when the time comes, wish I had that kind of money to throw around.

 

Idk what your deal is no need to be a *** about anything cheif

 

if it is a rebuilt trans you do not have to use DEX III. When you rebuild them the clutch material is the same type they use in the vehicles that require synthetic either fluid will work. My transmission has all but 182,000 on it 30,000 of them is what I put on it and the first thing I did is service the trans and the fluid I used was the synthetc and Ive had no problems with it. At work when we do a service on a vehicle it gets the synthetic mercon 5 even if it says dex III and guess what we have no problems

 

What makes it the AW4 is the bell and the tailhousing the insides and the case are all A340E which is used in toyotas and lexus

 

So atf4 is fine?

 

Try again - the AW4 is a 30-40LE with an extra clutch, built by Toyota, designed by Toyota, as used in the Celica, Supra, pickup, RWD van, and some RWD Lexus.

Just as the axles are shipped from Dana, the transmissions are shipped from Toyota - and the Toyota spec applies.

The BA-10 shipped from Peugeot, the AX-4, AX-5, and AX-15 all ship from Toyota (they're derivations of Toyota designs with different monikers - I believe the AX-15 is essentially a Toyota R150 light truck transmission.)

The early T4/T5 transmission (1984-1986 4-150 and V6-173) shipped from BorgWarner, and BorgWarner specs would apply in those cases (fortunately, they're just GL-3 gear oil to protect the bronze synchroniser rings, as in the AX-4/5/15. The BA-10 doesn't have a speck of yellow metal in it, which is why it can use GL-5. I know the FSM sez to use GL-5 in the AX-15 et al - this is one of those very limited cases where the FSM is itself wrong.)

I've heard of a TSB that sez the ATF +4 "Multi-Spec" can be used in the AW4, but reports from the field are mixed at best. Ergo, since Dexron is still available, use Dexron and save yourself the headache.

(TANGENT: Reports from the field on "power-flushing" the AW4 by forcing fresh fluid through it are mixed, but generally negative. If you suspect it's crudded up, the best method found to date is to buy a case of Dexron and 3-4 cans of B-12 "Chemtool" - dump in a can of Chemtool and change the fluid - hot! - in 1,000 miles. Repeat twice. This seems to be easier on the transmission and clutches than powerflushing.)

But, considering nearly every AW4 slushbox I've seen has had "Aisin Seiki" ID plates on it, I feel secure in saying it's a Toyota design as used...

 

Yes I dont care what anyone else says.Rebuilding and R&R Transmissions is what I do for living Ive been doing it since 2003 its what I specialize in

 

Thanks man

 

Objectiively: Speedy Transmissions makes a living rebuilding transmissions and look at how that worked out, not to mention you're looking right at a sheet that says to use Mercon. For what it's worth, my Haynes manual tells me the same..

 

Im a techician at a chrysler dealer. we have been putting ATF+4 in AW4s for along time and never had any issue with them here is a service bulletin released by chrysler.

Chrysler Service Bullentin 21-014-07


NUMBER:

 

Thanks for the info man