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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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Bob2C Enthusiast

Bob2C

Posted
Posted

you could remove the transmission line from the radiator and see if oil is flowing when the vehicle is running. And if so the flow rate. Maybe there is a blockage somewhere.


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flyingfool Senior Enthusiast

flyingfool

Posted
Posted (edited)

 yeah unplug the cooler lines and run into a bucket and see if they are flowing..

   

pick up a cheap harbor freight  laser temp gun,  shoot the lines, oil cooler,  torque converter if accesable... even the trans case and pan, good to note all the temp variations

next upgrade install fan on cooler

 

if your serious, pick up a used HPtuners module pre Bluetooth model, this will allow you access into the trans ecu for data logging all the parameters and sensors inside

 

 

Edited by flyingfool
flyingfool Senior Enthusiast

flyingfool

Posted
Posted

if you drop the pan  and pull the filter , cut the filter open and make sure there's no metal being caught

Stevenmorris.us Enthusiast

Stevenmorris.us

Posted
Posted

Mine was just replaced by the dealership, in 102* i hit 202 doing 90mph for about 80 miles or more straight. Most of the 200mile trip I made it’s between 190-196*.

My converter went bad as well and is what cause the whole trans to be replaced. If your hitting 240 something is definitely wrong, or not flowing the correct way. When they flushed your trans cooler and installed new one did they flush it correctly or did they even flush it? Not sure of the quality of shop you went to but I have heard some places cut corners with that.


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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted (edited)
7 hours ago, Stevenmorris.us said:

Mine was just replaced by the dealership, in 102* i hit 202 doing 90mph for about 80 miles or more straight. Most of the 200mile trip I made it’s between 190-196*.

My converter went bad as well and is what cause the whole trans to be replaced. 

 

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-your-next-rebuild

 

 

Edited by Grumpy Bear
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mookdoc6 Senior Enthusiast

mookdoc6

Posted
Posted
33 minutes ago, Grumpy Bear said:

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-your-next-rebuild

 

 

Very nice Grumps!  I feel the 8L90 while it has it's moments is very robust.  Weak link seems to be Torque converters,Cheap wire harness and crap fluid that needs to be replenished often.  

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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
On 7/23/2020 at 6:09 PM, Jcantu2187 said:

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 

Just to be clear either method works. Flip the pill OR remove it and plug the bypass. Not both.

 

You may have noticed when you had it apart that the plug itself partially restricts the lines flow in some positions. It will be obvious. 

 

That said...sounds like more that this....

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
2 hours ago, mookdoc6 said:

Very nice Grumps!  I feel the 8L90 while it has it's moments is very robust.  Weak link seems to be Torque converters,Cheap wire harness and crap fluid that needs to be replenished often.  

If you go to PATC transmissions you will note that the converters they use of severe service are billet on the clutch side. I don'[t worry much about Peppers box as I don't haul or tow with her and I keep her like an ice box. Gotta have some place to chill da beers. :)  

mookdoc6 Senior Enthusiast

mookdoc6

Posted
Posted
41 minutes ago, Grumpy Bear said:

If you go to PATC transmissions you will note that the converters they use of severe service are billet on the clutch side. I don'[t worry much about Peppers box as I don't haul or tow with her and I keep her like an ice box. Gotta have some place to chill da beers. :)  

I am in same boat although I do notice my 8l90 is definitely meant to run hot and shifts accordingly to temp.  I don't tow either but drive frequently you have 6speed and they seem far less finicky than the 8's 

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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
2 minutes ago, mookdoc6 said:

I am in same boat although I do notice my 8l90 is definitely meant to run hot and shifts accordingly to temp.  I don't tow either but drive frequently you have 6speed and they seem far less finicky than the 8's 

I just put a shout out to PATC. Doing some fishing. See what I catch, eh? 

M1ck3y Senior Enthusiast

M1ck3y

Posted
Posted
17 hours ago, Stevenmorris.us said:

Mine was just replaced by the dealership, in 102* i hit 202 doing 90mph for about 80 miles or more straight. Most of the 200mile trip I made it’s between 190-196*.

My converter went bad as well and is what cause the whole trans to be replaced. If your hitting 240 something is definitely wrong, or not flowing the correct way. When they flushed your trans cooler and installed new one did they flush it correctly or did they even flush it? Not sure of the quality of shop you went to but I have heard some places cut corners with that.


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What happened exactly that they approved a replacement transmission. I easily hit 185 driving around the city for an hr when its 86* out. Cant imagine where it would be at towing at its rated capacity.

Stevenmorris.us Enthusiast

Stevenmorris.us

Posted
Posted
What happened exactly that they approved a replacement transmission. I easily hit 185 driving around the city for an hr when its 86* out. Cant imagine where it would be at towing at its rated capacity.

The converter failed and caused debris to pass through transmission, which caused more damage. Replaced whole trans and converter with a 12month 12k warranty no questions asked at all.


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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
11 hours ago, Stevenmorris.us said:


The converter failed and caused debris to pass through transmission, which caused more damage. Replaced whole trans and converter with a 12month 12k warranty no questions asked at all.


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Which is exactly what SONNAX said. 

flyingfool Senior Enthusiast

flyingfool

Posted
Posted
20 hours ago, Grumpy Bear said:

If you go to PATC transmissions you will note that the converters they use of severe service are billet on the clutch side. I don'[t worry much about Peppers box as I don't haul or tow with her and I keep her like an ice box. Gotta have some place to chill da beers. :)  

or you can try ordering a 2012 Isuzu NPR 4500HD torque converter, this is in one of my trucks and its rock solid, but it doesnt have the clutch system. so no lock up..

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