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Re: Transmission Tmp gauge - should I ? where? [message #351516 is a reply to message #351494]

Wed, 22 January 2020 09:47

Russell K.

Messages: 178
Registered: October 2016
Location: Dunedin, Florida

Karma:

Senior Member

The THM 375/400/475/425 Troubleshooting Guide by GM states a normal operating temperature of 170F.
http://www.bdub.net/manuals/THM_425_Trouble_Shooting.pdf

Other transmission related websites say an "Ideal" operating temperature is 175F.
https://aljetsautomotive.com/transmission-fluid-flush-tips
https://mechanicbase.com/transmission/normal-operating-temperature-for-an-automatic-transmission/

If you look at the many transmission fluid temperature charts online, you'll see that transmission life and transmission fluid life are greatly reduced at temperatures sustained over 200F.

https://www.google.com/search?q=transmission+fluid+temperature+chart&sxsrf=ACYBGNQaUEqnina7kD2Cbe07foDyUHe9DQ:1579706774434&source=lnms&tb m=isch&sa=X&ved=2ahUKEwiFq46pwpfnAhWvmuAKHZZZDy0Q_AUoAnoECAsQBA&biw=2133&bih=1076

My transmission temp gauge usually stays between 150F and 180F; while my coolant temperature gauge hovers around 190F (190 thermostat). I do not have an auxiliary cooler.

The consensus is definitely "cooler is better" for transmission life. If you can't keep it under 200F, then other measures should be taken to reduce the temp, such as an auxiliary trans fluid cooler, or reduce the load, and change the fluid more often.

1978 Eleganza II, Dunedin, Florida

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[Message index]

		Transmission Tmp gauge - should I ? where? By: hertfordnc on Mon, 20 January 2020 06:53
		Re: Transmission Tmp gauge - should I ? where? By: Russell K. on Mon, 20 January 2020 07:10
		Re: Transmission Tmp gauge - should I ? where? By: Matt Colie on Mon, 20 January 2020 09:45
		Re: Transmission Tmp gauge - should I ? where? By: hertfordnc on Mon, 20 January 2020 10:05
		Re: [GMCnet] Transmission Tmp gauge - should I ? where? By: James Hupy on Mon, 20 January 2020 10:39
		Re: Transmission Tmp gauge - should I ? where? By: 6cuda6 on Mon, 20 January 2020 12:19
		Re: Transmission Tmp gauge - should I ? where? By: Russell K. on Tue, 21 January 2020 08:06
		Re: Transmission Tmp gauge - should I ? where? By: Russell K. on Tue, 21 January 2020 09:16
		Re: Transmission Tmp gauge - should I ? where? By: 6cuda6 on Tue, 21 January 2020 09:46
		Re: [GMCnet] Transmission Tmp gauge - should I ? where? By: jimk on Mon, 20 January 2020 08:18
		Re: Transmission Tmp gauge - should I ? where? By: jhbridges on Mon, 20 January 2020 12:12
		Re: Transmission Tmp gauge - should I ? where? By: Larry on Mon, 20 January 2020 12:21
		Re: Transmission Tmp gauge - should I ? where? By: hertfordnc on Mon, 20 January 2020 16:10
		Re: Transmission Tmp gauge - should I ? where? By: tmsnyder on Mon, 20 January 2020 22:17
		Re: [GMCnet] Transmission Tmp gauge - should I ? where? By: James Hupy on Mon, 20 January 2020 16:43
		Re: [GMCnet] Transmission Tmp gauge - should I ? where? By: Ken Henderson on Tue, 21 January 2020 07:00
		Re: Transmission Tmp gauge - should I ? where? By: Larry on Thu, 23 January 2020 13:51
		Re: Transmission Tmp gauge - should I ? where? By: JohnL455 on Tue, 21 January 2020 08:32
		Re: Transmission Tmp gauge - should I ? where? By: hertfordnc on Tue, 21 January 2020 09:42
		Re: [GMCnet] Transmission Tmp gauge - should I ? where? By: Emery Stora on Tue, 21 January 2020 10:19
		Re: Transmission Tmp gauge - should I ? where? By: jhbridges on Tue, 21 January 2020 08:44
		Re: Transmission Tmp gauge - should I ? where? By: 6cuda6 on Tue, 21 January 2020 09:53
		Re: Transmission Tmp gauge - should I ? where? By: hertfordnc on Tue, 21 January 2020 10:15
		Re: Transmission Tmp gauge - should I ? where? By: Russell K. on Wed, 22 January 2020 09:47
		Re: Transmission Tmp gauge - should I ? where? By: Jp Benson on Wed, 22 January 2020 10:23
		Re: Transmission Tmp gauge - should I ? where? By: Deb on Wed, 22 January 2020 11:53
		Re: Transmission Tmp gauge - should I ? where? By: Glenn on Wed, 22 January 2020 16:02
		Re: Transmission Tmp gauge - should I ? where? By: Matt Colie on Wed, 22 January 2020 16:15
		Re: Transmission Tmp gauge - should I ? where? By: Glenn on Wed, 22 January 2020 18:24
		Re: Transmission Tmp gauge - should I ? where? By: tmsnyder on Thu, 23 January 2020 13:00
		Re: [GMCnet] Transmission Tmp gauge - should I ? where? By: powwerjon on Wed, 22 January 2020 11:05
		Re: [GMCnet] Transmission Tmp gauge - should I ? where? By: James Hupy on Wed, 22 January 2020 11:34
		Re: Transmission Tmp gauge - should I ? where? By: JohnL455 on Tue, 21 January 2020 17:23
		Re: Transmission Tmp gauge - should I ? where? By: hertfordnc on Wed, 22 January 2020 07:19
		Re: Transmission Tmp gauge - should I ? where? By: JohnL455 on Wed, 22 January 2020 08:58
		Re: Transmission Tmp gauge - should I ? where? By: Matt Colie on Wed, 22 January 2020 14:16

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