06 LBZ, 6 Speed Allison cooler lines leaking

[Petrella]

Just crawled under my truck this afternoon, and i noticed that my tranny cooler lines are leaking ATF. On both hoses right where the hose crimps on to the aluminum pipe that runs to the cooler, i got it running down my frame and its taking the paint with it. Truck only has 7500 miles on it! My buddy has the same truck as me but dually, sure enough his are leaking too!, crawled under my uncles truck which is the exact same truck as mine, also 2006, his are just starting to sweat and hes only got 4500 miles on his. Looks like a common problem. What bothers me is that the dealer will change them and then they will probably leak again!, anyone else got this problem?

Anthony
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2006 GMC Sierra 4x4 CC SB SLT LBZ/6 Speed
Dark Pewter Leather and Power Sunroof
305 70R/16 tires on Eagle 16x10 rims
Chrome wire mesh grille
Alpine Stereo, Navigation, and flip down rear screen
Autometer Cobalt gauges
Mag-Hytec Diff cover
pics of my truck - http://www.picturetrail.com/gallery/view?p=999&gid=12647120&uid=2685617&members=1

[More Power]

Some aftermarket dude needs to market a set of ATF lines with AN fittings. ;)

We did a story on the 6.5 engine oil cooling lines a year or two ago (they have the same problem). The original crimped sleeves were split with a Dremel cutoff wheel, then a HD clamp was used over the split sleeves to apply a leakproof amount of clamping force. As reported in the 6.5 forum, NAPA makes the clamps (look like miniature muffler clamps).

By the way, the Allison ATF cooling lines are made from 5/8" steel tubing - not aluminum (at least for the 2001 model year trucks).

Jim

[mark45678]

my 2006 truck needed the line that goes from the front mounted cooler to the rad , it started leaking around 15000 miles. Good thing is they dont blow out just drip, maybe a QT in 2000 miles.

[SatchMax]

Found my lines leaking and took to dealer for fix. My 07 ccdad classic has only 6000 miles also. Is this a problem they can not fix or just bad parts. Never noticed this with my 02 and 05 trucks. Right now mine is fixed, but will wait an see
SatchMax
Lubbock, Tx
07 ccdad with juice and 4 inch exhaust

[More Power]

The manufacturers like the "snap-in" oil/ATF cooling lines cuz they speed assembly. Unfortunately, they aren't as leak-free as we'd like. The Allison and various coolers use a bunch of them. Sure would be nice for the aftermarket to offer a set using all AN fittings...

In a month or two, there'll be an installed base of over 1M Duramax 6600 powered vehicles.... :)

Jim

[2tough2park]

6500 miles and so far so good. I just checked and they look good. I'll keep my fingers crossed. But you can be sure as shootin' I'll be back to the dealer first sign of a leak.