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Transmission temp

Jcantu2187

By Jcantu2187
in Engines & Drivetrain

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Grumpy Bear
Grumpy Bear

PAO has an oxidation initiation temperature around 250 F. Seals go next and so on. This charts fluid numbers are for mineral oils. By the time you varnish a PAO the seals are in trouble. 

Grumpy Bear
Grumpy Bear

Anybody read the white paper from SONNAX on the 6L80/90 torque converters?   https://www.sonnax.com/tech_resources/845-6l80-6l90-transmission-tech-advisory-consider-an-updated-converter-in-y

Bob2C
Bob2C

You don’t need to completely remove the pan to get the filter out. I did it by sliding it all the way to the passenger side which leaves enough room for the filter to come out. Sprayed and wiped out p

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Jcantu2187 Enthusiast

Jcantu2187

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2 minutes ago, flyingfool said:

who ever installed it , did something wrong..

Thats what im thinking i let the sun go down and check it out myself I saw some videos on youtube and it dont look hard.. just got to pick wich one to do since there are different ways to do it

Black02Silverado Senior Enthusiast

Black02Silverado

Posted
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If your transmission did get that hot.  I would change out the fluid.  It pretty much is toast.  Especially since it more than likely isn't a 100% synthetic fluid which most transmission shops use the least expensive fluid that meets the specification. 

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Bob2C Enthusiast

Bob2C

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If your transmission did get that hot.  I would change out the fluid.  It pretty much is toast.  Especially since it more than likely isn't a 100% synthetic fluid which most transmission shops use the least expensive fluid that meets the specification. 

What’s the max temp for amsoil before it’s shot?


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Grumpy Bear Senior Enthusiast

Grumpy Bear

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I'd be looking for a kink in the cooler lines if all else checks out okay. There was a TBS on that once upon' a. 

Black02Silverado Senior Enthusiast

Black02Silverado

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1 minute ago, Bob2C said:


What’s the max temp for amsoil before it’s shot?


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There is no specific temperature that I'm aware of.  If using AMSOIL's fluid the same rule applies as if you had the factory fluid.  The only difference is if you did get up high like 240°F you have way better protection since it is 100% synthetic.  AMSOIL did a study with their fluid on taxi cab's in Las Vegas during the heat of the summer out there.  The information is no longer on AMSOIL's site since it is outdated.  I'm sure if you Google it you can find were some other dealer has posted it.  I don't have it on mine because it is outdated.

 

The AMSOIL transmission fluid, ATL that was in my 2002 Silverado for 100k miles tested fine.  No issues at all and I towed a 4k lb trailer with it and the transmission would get up to 210°F on the interstate in the summer with outside temps at 98°F.

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Grumpy Bear Senior Enthusiast

Grumpy Bear

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14 minutes ago, Bob2C said:


What’s the max temp for amsoil before it’s shot?


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PAO has an oxidation initiation temperature around 250 F. Seals go next and so on. This charts fluid numbers are for mineral oils. By the time you varnish a PAO the seals are in trouble. transmission-fluid-life-.thumb.png.794ac83317a1d9195ed0011c651b32ff.png

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Bob2C Enthusiast

Bob2C

Posted
Posted
PAO has an oxidation initiation temperature around 250 F. Seals go next and so on. This charts fluid numbers are for mineral oils. By the time you varnish a PAO the seals are in trouble. transmission-fluid-life-.thumb.png.794ac83317a1d9195ed0011c651b32ff.png

Thanks Grumpy. Much appreciated


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truckguy82 Senior Enthusiast

truckguy82

Posted
Posted (edited)
1 hour ago, Grumpy Bear said:

I'd be looking for a kink in the cooler lines if all else checks out okay. There was a TBS on that once upon' a. 

If the trans cooler return line is hot, it should be flowing pretty good. Would be cool if it wasn’t.

 

those are about the same temps I was getting with a faulty oem trans thermostat that wouldn’t open and my driver side line was hot and passenger side line was ice cold (ambient)

Edited by truckguy82
M1ck3y Senior Enthusiast

M1ck3y

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Posted (edited)

You have stock suspension right? Air dam installed? What does your engine temp read.

Edited by M1ck3y
Grumpy Bear Senior Enthusiast

Grumpy Bear

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Posted
2 hours ago, truckguy82 said:

If the trans cooler return line is hot, it should be flowing pretty good. Would be cool if it wasn’t.

 

those are about the same temps I was getting with a faulty oem trans thermostat that wouldn’t open and my driver side line was hot and passenger side line was ice cold (ambient)

I should have been more precise. Kinked is not closed, just restricted so to an untrained hand....just saying....it cost nothing to look at all the hoses. Right? Free, simple and all???  :)

flyingfool Senior Enthusiast

flyingfool

Posted
Posted

i have a feeling the installer forgot to install the pipe plug into the t-stat block... this separates the two lines, cooled and hot side... without the plug , there probably is no flow ..

Grumpy Bear Senior Enthusiast

Grumpy Bear

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38 minutes ago, flyingfool said:

i have a feeling the installer forgot to install the pipe plug into the t-stat block... this separates the two lines, cooled and hot side... without the plug , there probably is no flow ..

That would do it! I just flipped the pill doing mine but if he gutted it and didn't plug it...BINGO!! hydro short circuit. :crackup:

truckguy82 Senior Enthusiast

truckguy82

Posted
Posted

Yeah but that line probably wouldnt be hot coming off the trans cooler.
 

If he had say like 20% or less flow through the cooler, i’d think the velocity would be so slow that it would be very cool. 

 

 

 

 

Jcantu2187 Enthusiast

Jcantu2187

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Posted (edited)
9 hours ago, flyingfool said:

i have a feeling the installer forgot to install the pipe plug into the t-stat block... this separates the two lines, cooled and hot side... without the plug , there probably is no flow ..

So i pulled of the t-stat opened it up and no it did not have a plug, the little deal inside was just flipped. I went ahead and tapped into it and placed a plug put the cap on and installed it.. but no luck i drove for a bit and still gets hot 

Edited by Jcantu2187
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