Transmission cooling lines leaking

2010LTZ4x4 · March 23, 2014

I'm going to replace the tranny lines that are seeping at the metal/rubber joints. Is there anything out of the ordinary when changing them out that I need to know. eg. how much tranny fluid will I loose, special tooling to undo the lines, do I need to worry about air pocket in the system after putting the new lines in? etc.

scooby5121 · March 23, 2014

Not under Warranty?

Engine mount has to be loosened........ bring it in for warranty

Your from Ontario, should still be covered.

2010LTZ4x4 · March 23, 2014

No thanks on the dealer, I'll get the new lines and do it myself. Had enough bad experiences with the dealer mechanics with the wifes van. My truck has not been to the dealer yet and I'm not going to start unless I really need to.

scooby5121 · March 24, 2014

No thanks on the dealer, I'll get the new lines and do it myself. Had enough bad experiences with the dealer mechanics with the wifes van. My truck has not been to the dealer yet and I'm not going to start unless I really need to.

There are some posts in here where they make new lines because the factory lines always let go at that crimp. The fix is actually cheap, they buy fittings and they say it eliminates the poor factory design crimp.

A line set is only sold in a set for the tranny, so there should be only one part number if I can remember from stock.

It Runs between the engine and the frame so thats why you have to loosen that area to get them on out and replace. All said and done they cost approx. 280.00 from a respectful auto shop.Other than that a couple wrenches and do not overtighten, Also a retaining clip on the fitting that has to come off,

Where in Ontario, I am in Oakville.

2010LTZ4x4 · March 24, 2014

Thanks, that helpful. I'm in Cambridge.

CKNSLS · March 24, 2014

Don't know about Canada...but many posts from owners in the U.S. saying "The dealer won't cover-it's a normal wear item".

mike94silverado · March 27, 2014

Yup I was told it was a wear item.....

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MikeNH · March 27, 2014

It's pathetic after all these years the crimps on GM oil/fluid lines are still crap. I had to change the engine oil lines on my 1998 Jimmy for that. Can't believe they can't get it right still.

wtbrowne · April 2, 2014

After market sources are available that offer much better quality than the OEM lines. No special tools are required and the motor mount does not have to be loosened. The link below shows the set that I used. Fairly simple for the novice mechanic and can be installed without a lift. You will need to remove the right front tire and the wheel liner. You'll lose about two quart of trans fluid during the install. The second link describes the process step by step with good photos to keep things clear. Once you have quality lines, you'll never need to do this again. The install is the same for 2001 through 2013 trucks.

https://www.alligatorperformance.com/Transmission-Repair-Lines-s/2444.htm

http://www.duramaxforum.com/forum/how-tos-diy-write-ups/87933-how-alligator-tranny-cooler-hoses-kit-install.html

TooTall1 · April 2, 2014

After market sources are available that offer much better quality than the OEM lines. No special tools are required and the motor mount does not have to be loosened. The link below shows the set that I used. Fairly simple for the novice mechanic and can be installed without a lift. You will need to remove the right front tire and the wheel liner. You'll lose about two quart of trans fluid during the install. The second link describes the process step by step with good photos to keep things clear. Once you have quality lines, you'll never need to do this again. The install is the same for 2001 through 2013 trucks.

https://www.alligatorperformance.com/Transmission-Repair-Lines-s/2444.htm

http://www.duramaxforum.com/forum/how-tos-diy-write-ups/87933-how-alligator-tranny-cooler-hoses-kit-install.html

Only seems to have transmission cooler lines for duramax trucks.