6L80E running hot - The 1947 - Present Chevrolet & GMC Truck Message Board Network

87Skier · 04-23-2018, 06:23 PM

Just did an engine and transmission swap and have been monitoring the transmission temps. I know the 6L80/90's run hotter than the TH350/TH400 and 4L60/80 stuff, but my transmission likes to stay around 220 F. It can easily climb passed 240 F while climbing long grades. This is all in 30-40 F weather, not even mid-summer extremes.

My current setup uses the transmission cooler built in to my radiator, along with an external unit. The external unit is probably undersized, but it was already setup from the turbo350 it had in it before.

I feel like I'm out of options and need to upgrade to something like this: https://www.summitracing.com/parts/der-13900/overview/, especially before summer time.

Has anyone else run into this?

04-23-2018, 06:23 PM	#1
87Skier Registered User Join Date: Mar 2014 Location: Corvallis, OR Posts: 711	6L80E running hot Just did an engine and transmission swap and have been monitoring the transmission temps. I know the 6L80/90's run hotter than the TH350/TH400 and 4L60/80 stuff, but my transmission likes to stay around 220 F. It can easily climb passed 240 F while climbing long grades. This is all in 30-40 F weather, not even mid-summer extremes. My current setup uses the transmission cooler built in to my radiator, along with an external unit. The external unit is probably undersized, but it was already setup from the turbo350 it had in it before. I feel like I'm out of options and need to upgrade to something like this: https://www.summitracing.com/parts/der-13900/overview/, especially before summer time. Has anyone else run into this? __________________ 1972 GMC Jimmy Custom 4.8L (L20)/6L90E/NP205 1989 Chevy Suburban V2500 350/Turbo 400/4.11 gears 1996 Chevy Suburban K1500 350/4L60E



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