Whippersnapper02
Senior Member
Is the tranny hunting? Fluid level ok? Definitely not the fluid choice.
Multiple transmission overheating episodes
- Thread starter XswampX
- Start date
CutthroatSlam
Senior Member
Well we’ve got 190K miles on the Maxlife synthetic ATF and no problems. Scoreboard beats internet know it alls who really know nothing. The Toyota OEM oils are simply rebranded product from the major oil company’s.
Jetboy
New member
Do you really want to compare your cute anecdote to hundreds of millions of miles of testing? If it helps my last 4runner had 200k on the original fluid. And no problems. So have tens of thousands of them.
The unusual data point is an overheating transmission. The obvious answer is obvious.
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im going with reduced airflow to radiator.. while rock climbing how much air could you possibly be moving to cool the radiator? It's completely relying on the fan. In stock form the fan moves plenty of air to keep temperatures moderated but now you've got an oil cooler which is ultimately trying to dissipate its own heat and pulling right back into the radiator.
When you say check fluid level, did you properly adjust the fluid at the right temperature?
When you say check fluid level, did you properly adjust the fluid at the right temperature?
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Teamoatmealpie
New member
<iframe width="560" height="315" src="https://www.youtube.com/embed/yml8AWYfUMw?start=2" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
Why would you replace the tranny fluid at 9k- this makes no sense.
Why would you replace the tranny fluid at 9k- this makes no sense.
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SpeedyKevin
New member
Throwing this out there before it gets lost lol
borfoo3
New member
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.
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.
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CutthroatSlam
Senior Member
Yep reduced airflow on a cooling circuit pushed beyond its thermal limit by an added supercharger. Non-OEM Synthetic ATF had nothing to do with this and never will.
You’re fixated on a damn manual that specs OEM fluids made for them by the same manufacturers of off the shelf fluid. They know this works on simple minds.
Jetboy
New member
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....
MTN4RNR
New member
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.
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 [MENTION=123911]borfoo3[/MENTION], thanks!
I'm going to monitor temps in the future. Check and swap fluid level then consider an auxiliary trans fluid cooler.
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 [MENTION=123911]borfoo3[/MENTION], thanks!
I'm going to monitor temps in the future. Check and swap fluid level then consider an auxiliary trans fluid cooler.
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MTN4RNR
New member
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!
SpeedyKevin
New member
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
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.
MTN4RNR
New member
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.
nevada
Senior Member
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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Charlievee
Senior Member
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?
CutthroatSlam
Senior Member
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.
