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4L60E fittings

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Old May 21, 2025 | 04:46 PM
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Default 4L60E fittings

Does anyone know the fitting sizes for the truck 4L60E circa 2004 along with the radiator and transmission cooler? These have the E clip provision but I would like to run AN hose. The cooler and radiator appear to have the same fittings but they measure different.
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Old May 21, 2025 | 05:43 PM
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Use 551114 for the trans
Most GM radiators are either 1/2 20 inverted flare or 1/4" NPT for the trans cooler fittings. I've never seen a trans quick connect to AN6 fitting
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Old May 21, 2025 | 09:38 PM
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Old Jun 3, 2025 | 09:59 AM
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I recently used this kit and it worked great on a TBSS. https://amzn.to/43swZEi
To hook up to the stock quick connects at the radiator I used two of these fittings from ICT billet.
https://amzn.to/4dPV9vU
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Old Jun 13, 2025 | 05:03 PM
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does anyone know what the fittings are used to connect to a 2013 truck 4L60E? I want to replace the factory lines with braided hose to run an aftermarket cooler. I think that the sizes are different after 2007? but not sure.

thanks!!
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Old Jun 14, 2025 | 12:42 PM
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Some of the later truck stuff has larger lines. Not sure but older ones have newer are like 3/8.
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Old Jun 23, 2025 | 01:47 PM
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Don't know if there would be a difference in size or for the year. But I ordered everything from here. It's all 6AN.

Stainless Braided Transmission Oil Cooler Lines | Chevy Silverado and GMC Sierra Forum
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