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Im sorry, but it is kind of funny GM 21-NA-199

14burrito

By 14burrito
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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
55 minutes ago, vrizrak said:

Does anyone has ran a pill flip while standing still in the traffic when it's 100F outside? For longer than 15 20 minutes?

Yes, 

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14burrito
14burrito

Plenty of discussions with the dealer and techline in regards to the operating temps that GM set forth on the powertrain for our Tahoe. They said both engine and gearbox temps were normal and as expec

M1ck3y
M1ck3y

They'll get to the 8 spd once it get's closer to the end of it's life cycle.

newdude
newdude

End of the day it all came down to CAFE/Fuel economy ratings.  The faster the trans got to operating temp, the faster it could produce less friction, the faster it gets better fuel economy.    

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vrizrak New Member

vrizrak

Posted
Posted
7 minutes ago, Grumpy Bear said:

Yes, 

What highest temp have you noticed? I really curios to see what temp are you getting in heavy stop and go traffic. I did mine past weekend. I was getting constant 185-190 regardless of the outside temperature. Now since pill flip initially while driving I was reading about 120. After 10 min idling temp jumped to 140 ish. Then after driving 40 min at 40 50 mph it lowered to 130. Then after idling for some time I was getting 170. Outside temp that Sunday was about 55 degrees.

 

Now today we at 17 degrees. And during my morning commute I was getting 111. Driving on the highway lowered temp significantly. After 20 min at 70 I was reading 90. 

 

At this point I'm not sure if that what I want to see. Another question at temp I would need to adjust fluid level? 

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
53 minutes ago, vrizrak said:

What highest temp have you noticed? I really curios to see what temp are you getting in heavy stop and go traffic. I did mine past weekend. I was getting constant 185-190 regardless of the outside temperature. Now since pill flip initially while driving I was reading about 120. After 10 min idling temp jumped to 140 ish. Then after driving 40 min at 40 50 mph it lowered to 130. Then after idling for some time I was getting 170. Outside temp that Sunday was about 55 degrees.

 

Now today we at 17 degrees. And during my morning commute I was getting 111. Driving on the highway lowered temp significantly. After 20 min at 70 I was reading 90. 

 

At this point I'm not sure if that what I want to see. Another question at temp I would need to adjust fluid level? 

 

Highest ever temp I saw with pill flip was about 215 F sitting for an hour on a limited access highway behind an accident on a 95 F day. High enough the fans kicked on ever few minutes. Thus it cycled between about 190 F and 215 F. 

 

Here's a chart I post every time this gets asked. It's a few years worth of data I collected and plotted. 

The X axis is air temp in F and the Y axis is ATF fluid in F

 

My truck has only the radiator ATF cooler. Trucks with the second cooler in the A/C unit run a bit cooler. 

 

TransTemp.thumb.png.026abb0e57c15a77d3ae332bdbbbfe88.png

 

My 'normal' highway summer temp is between 155 and 165 F. City a bit warmer BUT much cooler than with the TBV GM put on them. As long as the transmission fluid is over about 70 F all programing for shift and TC operation is satisfied. Over 104 F spark and fuel are on 'normal' maps. Cooler is a bit richer and a little less timing. 

 

What you are seeing and so worried about it the way transmissions have been cooled since 1963. This TBV thing is something more recent in the entire history of transmissions and worries people silly than have never 'seen' what it was FOREVER. :)  Your transmission is fine. 

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
3 hours ago, vrizrak said:

Thanks Marty. At what temp you suggest to check level? 

 

With the pill flipped you don't have to worry about keeping the cooler and lines full. Just check at or above the normal hot operating temperature. For me that's around 160F or more. You still have to be at or over the cold check line however.

 

With the factory 192F unit over that. 

With the "New" factory unit over 158 F 

Both of those need the lines purged to get an accurate check. 

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NE18 Enthusiast

NE18

Posted
Posted

Transmission temperature is usually running 140 +\- 5F. It did top out at 158 today in traffic. I have noticed my engine runs 5-10F cooler now. Are others seeing that too?

palmer_df0130 Enthusiast

palmer_df0130

Posted
Posted

Does anybody know if the new tbv internals will swap out with the old tbv with the quick disconnect cooler lines? I have a 2014 Silverado and do not want to have to buy new cooler lines along with the new valve to make it work. Thanks.

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
6 hours ago, palmer_df0130 said:

Does anybody know if the new tbv internals will swap out with the old tbv with the quick disconnect cooler lines? I have a 2014 Silverado and do not want to have to buy new cooler lines along with the new valve to make it work. Thanks.

 

Yes they will!  :) And will swap into the 8L and 10L TVB's as well. 😉 

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

I don’t like any diesel after 2000, I don’t buy diesel anymore. I don’t like cylinder deactivation, I don’t buy them. If they tell me I can’t pick who works on it, I wouldn’t buy it. 

mikeyk101 Senior Enthusiast

mikeyk101

Posted
Posted (edited)

I'm sure there is one and it may have been mentioned earlier in this thread but I don't think torque is as important on this. I followed nice and tight when I did mine and not ham fisted crank it on as tight as possible. Just snug it fully down and a tad more and you will be fine.

 

Found it. The official torque values were listed on page 4 of this thread

 

In the event that anyone was sitting on the edge of their seat in anticipation for the torque specs, you may now rest.
The bolt that holds the thermostat housing to the transmission case = 16 FOOT POUNDS (192 INCH POUNDS)
The bolt that holds the cooler lines to the thermostat housing = 106 INCH POUNDS (8.8 FOOT POUNDS)
 
https://www.gm-trucks.com/forums/topic/253735-im-sorry-but-it-is-kind-of-funny-gm-21-na-199/?do=findComment&comment=2554987

Edited by mikeyk101
Added info
  • Thanks 2
Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
2 hours ago, mikeyk101 said:

In the event that anyone was sitting on the edge of their seat in anticipation for the torque specs, you may now rest.

 

Or down snug and two squeaks.

:dunno:

 

:banghead: 

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