6L90E Transmission temp - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Accelo** · 08-02-2024, 01:41 AM

175F to 200F is considered the ideal operating temperature for a transmission (Other sources say 160-180), and 150F is considered the minimum ideal operating temp.

No worries, may just be different weather.

**MJN** · 08-05-2024, 07:45 AM

Alright, thanks. I'll keep an eye on it. I did order a new baffle that goes on the radiator support to help direct more air into the cooler, the original one is damaged and missing the side flaps so might be losing air flow off to the sides instead of going through the cooler.

JJH Jimmy · 08-05-2024, 01:21 PM

The converter was probably not locking up while you were towing the camper in return slipping and building heat. 180 isn't anything to be concerned about.

**MJN** · 08-05-2024, 01:45 PM

Quote:

Originally Posted by JJH Jimmy

The converter was probably not locking up while you were towing the camper in return slipping and building heat. 180 isn't anything to be concerned about.

My understanding was that in tow/haul the converter locks up in 3rd and I was running 60 -65mph so it was in 5th on the flat stretches and downhill and 4th if we were going up hill. But the shifting between 4th and 5th would create heat for sure.

08-02-2024, 01:41 AM	#1
Accelo Senior Member Join Date: Mar 2015 Location: washington Posts: 2,280	Re: 6L90E Transmission temp 175F to 200F is considered the ideal operating temperature for a transmission (Other sources say 160-180), and 150F is considered the minimum ideal operating temp. No worries, may just be different weather.

08-05-2024, 07:45 AM	#2
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,046	Re: 6L90E Transmission temp Alright, thanks. I'll keep an eye on it. I did order a new baffle that goes on the radiator support to help direct more air into the cooler, the original one is damaged and missing the side flaps so might be losing air flow off to the sides instead of going through the cooler. __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com

08-05-2024, 01:21 PM	#3
JJH Jimmy Registered User Join Date: Jun 2012 Location: Schoolcraft, Michigan Posts: 928	Re: 6L90E Transmission temp The converter was probably not locking up while you were towing the camper in return slipping and building heat. 180 isn't anything to be concerned about. __________________ 1972 GMC Jimmy 4x4 LS Swap 1985 Chevy K20 1994 GMC Yukon 2021 GMC 2500HD Duramax AT4 My "It's a Jimmy Thing" Build http://67-72chevytrucks.com/vboard/s...d.php?t=583528 Budget Build 1985 K20 http://67-72chevytrucks.com/vboard/s...d.php?t=801565



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