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Old 01-07-2015, 02:35 PM   #31
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The newer transmissions are thermostat controlled, you could have a cooler the size of the bed in my truck and it will still be 195F loaded or not.
How do you explain the noticeable drop in my tranny temps after adding an additional cooler? It is the newer 6L80 used in the Caddy/Chevy/GMC truck lines.
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Old 01-07-2015, 02:41 PM   #32
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How do you explain the noticeable drop in my tranny temps after adding an additional cooler? It is the newer 6L80 used in the Caddy/Chevy/GMC truck lines.

Sorry bubba! I did not notice until just now that this was about Chevy, I am a Ford guy, I know nuttin about Chebby, please disregard.
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Old 01-08-2015, 12:29 PM   #33
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It would be odd if Ford now regulates the minimum tranny temps. All the research I did before I added my additional cooler says that you can't cool a tranny too much. The lower you go, the longer it lasts.

With the bitter cold now in place I kept an eye on my temps yesterday and today. At highway speeds it hovered around 100 F once it was fully warmed up, plus or minus a few degrees. It slowly warmed while stopped. I wish I could maintain that temperature going up a steep slog!
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Old 01-08-2015, 12:42 PM   #34
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Just to add another point of view, I have a 2014 1500 silverado v6 long bed. My tt is a same year canyon cat 17qbc. TT weighs in at about 4000-4500 loaded. I watch my trans temp and the highest it has ever gotten is 207%. That was in very slow almost stop and go traffic for about 45 minutes. It normally runs about 198 or so when towning level or to speed.
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Old 01-08-2015, 02:47 PM   #35
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It would be odd if Ford now regulates the minimum tranny temps. All the research I did before I added my additional cooler says that you can't cool a tranny too much. The lower you go, the longer it lasts.

With the bitter cold now in place I kept an eye on my temps yesterday and today. At highway speeds it hovered around 100 F once it was fully warmed up, plus or minus a few degrees. It slowly warmed while stopped. I wish I could maintain that temperature going up a steep slog!

Well, they are not regulating a minimum temp, it is not like they add a heater to the cooling circuit, the tranny will do it, even if it takes a while in very cold temps. The thermostat in the Ford 6 speed torqeshift does not even send fluid to the cooler until it reaches 190F. It also will not go into 6th if the temp is too low, viscosity rules inside a hydraulically actuated machine that is a transmission. I would imagine GM also uses some sort of thermostat as well. I am sure dodge uses duct tape and popsicle sticks...
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Old 01-08-2015, 09:24 PM   #36
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Well, they are not regulating a minimum temp, ...The thermostat in the Ford 6 speed torqeshift does not even send fluid to the cooler until it reaches 190F.
That's what regulating the minimum temperature means. Without a thermostat the minimum temp will go lower as the ambient temp drops. With the thermostat the fluid is retained until it gets up to 190.
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Old 01-08-2015, 09:42 PM   #37
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I think we are at two different angles on the same problem...

Have a good one!
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Old 04-03-2015, 01:16 AM   #38
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If your truck is a Chevy the DIC information center will tell you if you have exceeded maximum transmission temp.
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Old 04-03-2015, 07:40 AM   #39
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If your truck is a Chevy the DIC information center will tell you if you have exceeded maximum transmission temp.
Might even go into limp mode.

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Old 04-03-2015, 07:43 AM   #40
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I would imagine GM also uses some sort of thermostat as well. I am sure dodge uses duct tape and popsicle sticks...
Now that's funny!

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