4L80e Cooler Line Replacement Questions

[fancyTBI]

1995 C2500 4L80e with auxiliary cooler

I am getting ready to replace my transmission cooler lines but have a question. My transmission has the flared lines with fittings. The replacement lines I purchased are quick connects, but two different styles. I don’t know which quick connect to purchase for the transmission.

Factory lines on transmission case:

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Factory auxiliary cooler quick connect:

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Replacement lines from Inline Tube all have this flare:

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Replacement line from Sunsong has this flare:

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RockAuto lists several different quick connects for 96+.

1996 CHEVROLET C2500 PICKUP 5.7L V8 Fluid Cooler Line Connector | Shop Now at RockAuto

Transmission-Automatic Parts and More for Your 1996 CHEVROLET C2500 PICKUP at Reliably Low Prices. Fast Online Catalog. DIY-Easy. Your Choice of Quality. Full Manufacturer Warranty.

www.rockauto.com

The Inline Tube kit is 3/8. The original lines and Sunsong are 5/16.

I’m not familiar with quick connects besides the coolant quick connect in the intake. Everyone’s favorite!

 

[L31MaxExpress]

1995 C2500 4L80e with auxiliary cooler

I am getting ready to replace my transmission cooler lines but have a question. My transmission has the flared lines with fittings. The replacement lines I purchased are quick connects, but two different styles. I don’t know which quick connect to purchase for the transmission.

Factory lines on transmission case:

You must be registered for see images attach

Factory auxiliary cooler quick connect:

You must be registered for see images attach

Replacement lines from Inline Tube all have this flare:

You must be registered for see images attach

Replacement line from Sunsong has this flare:

You must be registered for see images attach

RockAuto lists several different quick connects for 96+.

1996 CHEVROLET C2500 PICKUP 5.7L V8 Fluid Cooler Line Connector | Shop Now at RockAuto

Transmission-Automatic Parts and More for Your 1996 CHEVROLET C2500 PICKUP at Reliably Low Prices. Fast Online Catalog. DIY-Easy. Your Choice of Quality. Full Manufacturer Warranty.

www.rockauto.com

The Inline Tube kit is 3/8. The original lines and Sunsong are 5/16.

I’m not familiar with quick connects besides the coolant quick connect in the intake. Everyone’s favorite!

Be glad you are not familiar with those dumb garbage quick connects. EVERYTHING transmission and oil cooler have those leaky POS things on my Express van. Dry so far after replacing the orings with appropriately sized red silicone o'rings but have my doubts. They leak in a year or two with the stock black rubber o'rings here in this heat. The heat just cooks the stock o'rings and they end up hardening and losing tension as well as cracking and leaking.

 

[udidwht]

My 94 Southwind Storm has the same fittings as your first pic. I removed the old lines and took them to a hydraulic hose shop and they made me new lines and brazed fittings on each end that allowed me to keep the OE threaded fittings.

 

[Schurkey]

1995 C2500 4L80e with auxiliary cooler

The Inline Tube kit is 3/8. The original lines and Sunsong are 5/16.

If the original tubes are 5/16, upgrading to 3/8 is nice, but you'll also need to replace the fittings in the transmission along with the fittings in the radiator and aux. cooler.

Sure you want to get that involved?

WHY are you replacing the original cooler tubes? What's wrong with them?

 

[Supercharged111]

The Sunsong one looks like the QD clip would just sit in that groove making me thing both ought to work fine if your truck already had them.

 

[fancyTBI]

If the original tubes are 5/16, upgrading to 3/8 is nice, but you'll also need to replace the fittings in the transmission along with the fittings in the radiator and aux. cooler.

Sure you want to get that involved?

WHY are you replacing the original cooler tubes? What's wrong with them?

I was going to replace the fitting but could not source them locally and the hydraulic shop didn’t have what I needed. Thinking ahead I ordered the Sunsong lines and they arrived at the same time as the Inline Tube.

I would have gotten that involved if I were able to source the parts.

They were rusty and one had developed a pin hole leak.

The Sunsong one looks like the QD clip would just sit in that groove making me thing both ought to work fine if your truck already had them.

They do work great, that’s what I ended up installing. They even came with new looking over the rubber sections.

 

[L31MaxExpress]

Its weird that the lines are 5/16". On my Express and Tahoe they are 3/8".