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Old 08-29-2019, 01:33 PM #31
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Originally Posted by borfoo3 View Post
I do keep track of my trans temps. On a modded T4R, it is not really difficult to push trans temps up once you push the truck harder while loaded. Thankfully, haven't seen any warning lights, but planning to do a trans fluid swap with the Toyota stuff.


Back to OP's scenario, and assuming the purpose here is to solve this and not start another fluid X vs stupid OEM stuff debate, let's start by summarizing some facts:

1. truck is fully loaded for a trip + steep incline = high load on the transmission

2. Upsized tires/ stock gearing = effectively increases torque demand on transmission

3. supercharged setup = added demand on transmission by means of higher engine torque output

4. Slow drive/ airflow blockage impedes transmission cooling.
Our transmission cooling is mainly based on 2 parts:
a. The in-radiator heat exchanger passing heat to/from trans and engine coolant fluids. Coolant is usually ~190f to 194f, and
b. Good airflow around the transmission body.

5. Warm days/ hot surfaces under the sun worsen #4 above

Basically, I believe OP scenario above is pushing the stock transmission cooling loop beyond its capability. OP using a non OEM ATF, for better or worse, is at least a variable at question here


Potential solutions:
1. Swap back OEM ATF fluid, flush lines and inspect for any blockage
2. Add trans temp monitor and keep track of temps. Higher than average temps for extended periods can degrade the ATF life
3. Consider added cooling for trans by adding an in-line cooler.
I concur with this assessment. Mods can come with consequences and sometimes require additional mods to remedy them. I would definitely flush what you have because it's likely compromised in some way at this point. Then fill with whatever ATF you feel meets your specifications.
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Old 08-29-2019, 01:41 PM #32
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Thanks everyone.

I changed the fluid as I believe Maxlife ATF is an absolutely top notch fluid.

I agree on stopping the bickering about factory recommended vs. not ATF. We have all said our peace.

Quote:
Originally Posted by MTN4RNR View Post
Being in 4lo in these situations where you're slow going for a long period uphill will help moderate transmission temperatures as there is less slipping higher in the power band than when you're grunting along at low rpm. It will also allow the fan to kick in at a higher RPM and move more air through the engine/transmission radiator.
This was all in 2Hi and 4Hi. I will try 4L. Great points ^ thanks.

I have no additional skid plates above stock.

No tranny hunting going on.

Solid post @borfoo3 , thanks!

I'm going to monitor temps in the future. Check and swap fluid level then consider an auxiliary trans fluid cooler.

Last edited by XswampX; 08-30-2019 at 12:51 AM.
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Old 08-29-2019, 01:57 PM #33
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Quote:
Originally Posted by XswampX View Post
Thanks everyone.

I changed the fluid as I believe Maxlife ATF is an absolutely top notch fluid.

I agree on stopping the bickering about factory recommended vs. not ATF. We have all said our peace.



This was all in 2Hi and 4Hi. I will try 4L. Great points ^ thanks.

I have no additional skid plates above stock.

No tranny hunting going on.

Solid post @borfoo3 , thanks!

I'm going to monitor temps in the future. Check and swamp fluid level then consider inline cooler.
Thanks for following up! Sounds like you are on the right path. Please do update with anything you find out through the fluid exchange process and if any changes help with your problem!
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Old 08-29-2019, 02:41 PM #34
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Quote:
Originally Posted by XswampX View Post
Thanks everyone.

I changed the fluid as I believe Maxlife ATF is an absolutely top notch fluid.

I agree on stopping the bickering about factory recommended vs. not ATF. We have all said our peace.



This was all in 2Hi and 4Hi. I will try 4L. Great points ^ thanks.

I have no additional skid plates above stock.

No tranny hunting going on.

Solid post @borfoo3 , thanks!

I'm going to monitor temps in the future. Check and swamp fluid level then consider inline cooler.
On some trails where I left it in 4hi, the pan fluid was reading over 240F. NOT good!

Re did the trail in 4Lo and it stayed near 190-210F
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Old 08-29-2019, 02:51 PM #35
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Quote:
Originally Posted by Jetboy View Post
You caused this by putting the wrong transmission fluid in it. Sorry to be the bearer of bad news. Next time use the real stuff. Toyota fluid is more expensive, but it's the only ATF that is appropriate for this transmission. And you should never change it. Maybe you can flush it and put Toyota fluid back in and it'll work better. Hopefully you didn't damage the clutches.

This video will help explain why you should use the correct ATF.

Wow, just wow. Can't believe there's such a fundamentally STUPID video as that one, at 40+ freaking minutes, with such weak logic.

Let me get this straight. Some old, anal, ocd retired engineer presumes he can "out" two very big automotive chemical companies for making products with nearly completely fabricated credentials/specs, just because they don't list the LICENSES on the actual bottles, and instead do some in paperwork else where most likely?

I freaking guarantee you Valvoline has all the licenses necessary to make the claims on their bottle, as evidenced not being sued by everyone who ever put that stuff in their car.

What a blowhard.

Listen to the myriad of other folks who said it ain't the fluid. It's the blocking of radiation and possibly extra load. Fix that and you'll be good.
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Old 08-29-2019, 02:56 PM #36
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Quote:
Originally Posted by Big_Cuss View Post
Wow, just wow. Can't believe there's such a fundamentally STUPID video as that one, at 40+ freaking minutes, with such weak logic.

Let me get this straight. Some old, anal, ocd retired engineer presumes he can "out" two very big automotive chemical companies for making products with nearly completely fabricated credentials/specs, just because they don't list the LICENSES on the actual bottles, and instead do some in paperwork else where most likely?

I freaking guarantee you Valvoline has all the licenses necessary to make the claims on their bottle, as evidenced not being sued by everyone who ever put that stuff in their car.

What a blowhard.

Listen to the myriad of other folks who said it ain't the fluid. It's the blocking of radiation and possibly extra load. Fix that and you'll be good.
We have all moved on...
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Old 08-29-2019, 02:58 PM #37
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Quote:
Originally Posted by MTN4RNR View Post
We have all moved on...
Not from the youtube views/comments, it seems. A good historical first part of that vid, but the contentions at the end (which is most of what people are taking away from the vid) are likely inaccurate.
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Old 08-29-2019, 03:01 PM #38
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Quote:
Originally Posted by XswampX View Post
Thanks everyone.

I changed the fluid as I believe Maxlife ATF is an absolutely top notch fluid.

I agree on stopping the bickering about factory recommended vs. not ATF. We have all said our peace.



This was all in 2Hi and 4Hi. I will try 4L. Great points ^ thanks.

I have no additional skid plates above stock.

No tranny hunting going on.

Solid post @borfoo3, thanks!

I'm going to monitor temps in the future. Check and swamp fluid level then consider inline cooler.
it doesn't have to be hunting for the converter to be making a ton more heat. the entire rig would work better with gearing appropriate to the larger tires, that includes the transmission...
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Last edited by nevada; 08-29-2019 at 04:48 PM.
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Old 08-29-2019, 03:57 PM #39
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Quote:
Originally Posted by XswampX View Post
Thanks everyone.

I changed the fluid as I believe Maxlife ATF is an absolutely top notch fluid.

I agree on stopping the bickering about factory recommended vs. not ATF. We have all said our peace.



This was all in 2Hi and 4Hi. I will try 4L. Great points ^ thanks.

I have no additional skid plates above stock.

No tranny hunting going on.

Solid post @borfoo3 , thanks!

I'm going to monitor temps in the future. Check and swamp fluid level then consider inline cooler.
Keep us up to date, i would like to see the remedy and the actual cause. Would also like to see if any other forced air rigs have the same issue. Was it common for the FJ's or taco's?
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Old 08-31-2019, 01:28 PM #40
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Quote:
Originally Posted by Jetboy View Post
it comes down to this
----------------------------------------------
use which fluid ? a or b

a--[what aisin and toyota engineers and materials scientists formulate as the fluid to use]

vs

b--[what some team of unknown and unaccountable random ****wits trying to reverse engineer what toyota paid millions for recommend, because it's a conspiracy]

Do what you wish. My transmission doesn't overheat....
c -- same petroleum engineers filling orders for Toyota engineers.

Do what you wish. My transmission doesn't overheat and I understand mechanics a hell of a lot more than you.
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Old 08-31-2019, 01:31 PM #41
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Quote:
Originally Posted by Big_Cuss View Post
Wow, just wow. Can't believe there's such a fundamentally STUPID video as that one, at 40+ freaking minutes, with such weak logic.

Let me get this straight. Some old, anal, ocd retired engineer presumes he can "out" two very big automotive chemical companies for making products with nearly completely fabricated credentials/specs, just because they don't list the LICENSES on the actual bottles, and instead do some in paperwork else where most likely?

I freaking guarantee you Valvoline has all the licenses necessary to make the claims on their bottle, as evidenced not being sued by everyone who ever put that stuff in their car.

What a blowhard.

Listen to the myriad of other folks who said it ain't the fluid. It's the blocking of radiation and possibly extra load. Fix that and you'll be good.
I made it less than a minute in and shut off. Guy is from Weber St. LOL. Might as well be from Boise St school of trucking.
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Old 08-31-2019, 04:32 PM #42
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@Jetboy : While I am not sure about the tranny fluid, I strongly disagree with your assessment that Rotella is bad for a gas engine. Yes, you might ruin your cat over time, but the engine itself will be very happy with the Rotella. Especially with the 5w-40 synthetic.
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Old 08-31-2019, 06:25 PM #43
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yea its just simply an opinion from an expert.. nothing scientific.. no analysis.. just a guy rehashing the same crap that's already been all over the internet..

now if we can get Project Farm from youtube to run analysis of Toyota WS then that would convince me
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Old 09-10-2019, 01:02 AM #44
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With outdoor temps in the 80s and light city driving (via Torque) my tranny temps are running 160-190. I decided to buy the Hayden 697 cooler and was able to mount it well spaced off of the SC LTR with some coupling nuts used as spacers. I also found an off the shelf 90 deg metal bracket at the hardware store that secured the bottom of the cooler to the 90 deg tab off the inside of the front bumper structural cross beam. Pretty clean mounting. Curious to see the drops, expecting at least 20 degrees. Out of an abundance of caution I am also going to fully flush the fluid and get fresh Valvoline MaxLife ATF back in. Not to rehash but from the Valvoline website,

"Suitable for use in ... Toyota WS"
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Old 09-10-2019, 10:21 AM #45
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Quote:
Originally Posted by CutthroatSlam View Post
c -- same petroleum engineers filling orders for Toyota engineers.

Do what you wish. My transmission doesn't overheat and I understand mechanics a hell of a lot more than you.
I'm a physicist. I sort of doubt that you do. But if you'd like to tell me the stokes number ideal for the clutch packs in the A750F - please educate us all! I'd love to learn about the particulate suspension differences between Type 4 and WS. Obviously we already know that WS is very different from Type 4 in both viscosity and additives based on lab tests. There's still a lot we don't know. Maybe you could help out?


It's not Toyota's engineers. It's the engineers from Aisin - who specifically state in the manual for the A750F not to use type 4. The viscosity is too high.

Last edited by Jetboy; 09-10-2019 at 10:25 AM.
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