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Transmission Cooler

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Old October 29th, 2018, 1:56 PM
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Default Transmission Cooler
I'm installing a separate transmission cooler on a 2001 savanna van. Which of the two cooler lines( top or bottom) into the radiator is the return line?
Transmission is not in the van.
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Old October 29th, 2018, 4:22 PM
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The one that's cooler to the touch :P
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Old October 30th, 2018, 7:04 AM
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you haven't posted enough info...do you have a 1500, 2500 or 3500? they have different transmissions..
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Old October 30th, 2018, 9:00 AM
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Originally Posted by LCAC_Man
you haven't posted enough info...do you have a 1500, 2500 or 3500? they have different transmissions..
I have the 2500 series with the 4L60-E transmission. Are the lines plumbed differently in the 4L80-e transmission?
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Old October 30th, 2018, 9:03 AM
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Originally Posted by mountainmanjoe
The one that's cooler to the touch :P
As stated in the original posting, the transmission is not in the van. I'm plumbing the transmission cooler in advance of the new tranny going in.
Both pipes are dangling under the van. Both feel the same at this point.
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Old October 30th, 2018, 12:20 PM
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4L60e pressure/outlet is the lower port, it would go to the upper connection on the radiator.
4l80e pressure/outlet is the front port.
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Old October 30th, 2018, 1:49 PM
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> Both feel the same at this point.

I'm just kidding.
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Old October 31st, 2018, 4:11 AM
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The top one should be the return line. Plumb your cooler in there.
Last edited by mountainmanjoe; October 31st, 2018 at 4:18 AM.
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Old October 31st, 2018, 8:32 AM
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Looked in the GM Service manual and they have the additional transmission cooler plumbed from the bottom line for the 4L60-E transmission.
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Oil Cooler plumbing.pdf (1,008.0 KB, 82 views)
Last edited by Ron6519; October 31st, 2018 at 8:41 AM. Reason: adding photo
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Old October 31st, 2018, 4:33 PM
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I've seen that diagram too. It's wrong.
The cooler is filled from the bottom to prevent aeration, and the makers of the aftermarket coolers recommend putting them downstream of your factory cooler.

Last edited by mountainmanjoe; October 31st, 2018 at 4:35 PM.
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