2016 Transmission Thermostat change

[Black02Silverado]

Finally got around to changing out the transmission thermostat to the new one GM is offering.  I want to say it is a 158°F.  I didn't like that the fluid ran at 200° all the time.  So now it should run cooler.  While in the mountains this past spring, it got up to 220°F.  I didn't like that.  So when we go back this coming spring it will be interesting to see how much it  has lowered it. 

[Grumpy Bear]

I hate waiting on data.  

[Black02Silverado]

Well so far the transmission has not gotten over 150°F and had it out on a 30 mile run at 78° outside temp.  This was some highway and mostly city traffic.  I'm happy with it. 

[CMoore711]

On 12/5/2021 at 6:03 PM, Black02Silverado said:

Well so far the transmission has not gotten over 150°F and had it out on a 30 mile run at 78° outside temp.  This was some highway and mostly city traffic.  I'm happy with it. 

 

What's the GM Part # to this new transmission thermostat?

[Black02Silverado]

11 minutes ago, CMoore711 said:

 

What's the GM Part # to this new transmission thermostat?

86774933 is the GM part number, list price is $103 but I'm sure you can get it for less at a dealer or online.

[14burrito]

The new tstat is stamped 135 vs the original 180 FYI

Edited December 14, 2021 by 14burrito

[Bob2C]

Changed mine last week as well. Got it through Folsom Chevy in California. Delivered for $63. 

[BlaineBug]

On 12/14/2021 at 8:20 AM, 14burrito said:

The new tstat is stamped 135 vs the original 180 FYI

That I believe is the initial opening temperature.  There is another 5 or 6 page mega thread about this.  I want to say 156 degrees is the fully opened temperature.  I may be wrong.

[14burrito]

9 hours ago, BlaineBug said:

That I believe is the initial opening temperature.  There is another 5 or 6 page mega thread about this.  I want to say 156 degrees is the fully opened temperature.  I may be wrong.

 

That's correct, crack open temps are the ones typically referenced. And I do recall something mid 150s on the full open within the GM TB.

 

I started the other thread I regards to TB 21-NA-199.

Edited January 26, 2022 by 14burrito

[BlaineBug]

https://www.gm-trucks.com/forums/topic/253735-im-sorry-but-it-is-kind-of-funny-gm-21-na-199/page/10/#comment-2563466

 

Here is more information than you'll ever need