Ordering correct transmission cooler lines

swathdiver · Jan 10, 2023

slowride77 said:
Hi All-

This thread came up on a search i ran here for transmission cooler lines. I have the standard return line leak that i see is common out there.
I am trying to find the torque spec for the bolt that holds the block that attaches the two lines to the driver's side of the transmission.
I have seen a few youtube videos that claim it is 18 lb-ft, but they were using the size of the bolt to determine that from what i could tell.
Anyone out there verify that or have the actual spec?

Also, any tips or tricks when replacing these line sets would be great!

16 foot pounds.

Remove the differential carrier mounting nuts (75 ft lbs) and washers allowing it to hang down some. Remove the bolts (37 ft lbs) from the bottom of the strut. That will give enough room to fish the lines out and in.

I use a Lisle 22930 to remove the lines from the cooler and radiator.

slowride77 · Jan 10, 2023

swathdiver said:
16 foot pounds.

Remove the differential carrier mounting nuts (75 ft lbs) and washers allowing it to hang down some. Remove the bolts (37 ft lbs) from the bottom of the strut. That will give enough room to fish the lines out and in.

I use a Lisle 22930 to remove the lines from the cooler and radiator.

I have the 22930 Lisle tool. Thanks for the torque spec.

Any pics or exploded views of the parts you are referring to?

swathdiver · Jan 10, 2023

It's not letting me copy and paste.

Geotrash · Jan 10, 2023

swathdiver said:
16 foot pounds.

Remove the differential carrier mounting nuts (75 ft lbs) and washers allowing it to hang down some. Remove the bolts (37 ft lbs) from the bottom of the strut. That will give enough room to fish the lines out and in.

I use a Lisle 22930 to remove the lines from the cooler and radiator.

James, do you think this same technique would work for the oil cooler lines as well?

swathdiver · Jan 10, 2023

Geotrash said:
James, do you think this same technique would work for the oil cooler lines as well?

Yes, I had forgotten that we loosened the bolts on the driver's side differential and let it hang low. We also were replacing the engine mount with an H3 mount. Did not have to mess with the strut on the driver's side.

slowride77 · Jan 10, 2023

swathdiver said:
16 foot pounds.

Remove the differential carrier mounting nuts (75 ft lbs) and washers allowing it to hang down some. Remove the bolts (37 ft lbs) from the bottom of the strut. That will give enough room to fish the lines out and in.

I use a Lisle 22930 to remove the lines from the cooler and radiator.

I found this video on YouTube. I believe this is what you are referring to at the 12 min mark.

Diff carrier nuts

swathdiver · Jan 10, 2023

slowride77 said:
I found this video on YouTube. I believe this is what you are referring to at the 12 min mark.

Diff carrier nuts

Yep, that's it.

thauglor1119 · 2025-01-17T16:26:19-0500

Hi all, instead of creating a new thread I figured just keep adding to this one as it was one of the first results in search.

I have a 2011 LT with the KNP code, only 1 line is leaking, but this is part of the two line set in part number 25999420. Can anyone confirm that I do not need 15779543 as well?

I think the 1577 line goes from the radiator cooler (top line) to the aux cooler, is that correct?

Thanks!

Drivers side looking towards passenger side

OR VietVet · 2025-01-17T17:09:46-0500

@thauglor1119, welcome to the forum from Oregon.

You should start your own thread about your lines and truck. You will get more responses that way.

I don't think a mod can pluck your one response to another thread and you should start your own.

mikez71 · 2025-01-17T17:23:48-0500

yep the 1577 is the short line.

Ordering correct transmission cooler lines

swathdiver

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slowride77

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swathdiver

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Geotrash

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swathdiver

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slowride77

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swathdiver

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thauglor1119

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OR VietVet

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