Rough idle on Vortec 5.7

[HotWheelsBurban]

Well Suburban down...not sure how or what happened but all my transmission fluid is no longer in the transmission.

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Cooler or cooler lines? Or front pump or tailshaft seal? From the puddle shape I'd say cooler or cooler lines.

 

[97Kharon]

Cooler or cooler lines? Or front pump or tailshaft seal? From the puddle shape I'd say cooler or cooler lines.

Yup cooler line age is catching up on this old girl

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[Schurkey]

Somebody didn't bother to put a bead on the end of that tube, and they didn't use proper hose clamps.

Those clamps are infamous for having the hose cold-flow though the slots cut into the band. They ought to be illegal. The hose diameter decreases under clamp load, the clamp loses tension, then the hose slides off the non-beaded tube. ATF is SURPRISINGLY flammable. Good thing you didn't burn the truck down.

Bead the tube--a double-flaring set works well for this. Just squeeze the tube a little, just enough to bulge it a bit.

Then use SHIELDED clamps of the proper size. There are shielded worm-gear clamps similar to what's on there now, there's the "fuel injection" clamps which may or may not be available in a large-enough diameter. There's various kinds of spring clamps. Point is, you want a clamp that doesn't allow the rubber to push through the slots in the clamp.

Be sure to use hose rated for trans cooler/PS return usage. Not only does it have to have chemical compatibility with ATF, it has to be stable at high temperature.

 

[Komet]

It wouldn't be a second hand Chevrolet without hacked off cooler lines! Definitely get a flare on that pipe with a fresh hose and better clamp.

 

[someotherguy]

Somebody didn't bother to put a bead on the end of that tube

Seems like they never do. Just chop it off and run..

ATF is SURPRISINGLY flammable. Good thing you didn't burn the truck down.

This can't be overstated. High pressure blast of ATF all over a hot engine's exhaust is a recipe for instant disaster.

Be sure to use hose rated for trans cooler/PS return usage. Not only does it have to have chemical compatibility with ATF, it has to be stable at high temperature.

Also can't be overstated. Regular hose won't do it. There is specific "transmission cooler hose" available at the auto parts store; it will be stamped as such. It's got the chemical, temperature, and pressure rating for the application.

Richard