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Transmission fluid leak

bgbdwlf2500

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bgbdwlf2500 Enthusiast

bgbdwlf2500

Posted
Posted

Apparently I have a fluid leak on my radiator to transmission line. I took it to a gm mechanic with his own shop and the quote was around 300. I'm mechanically inclined and should have the tools I need but I don't like to take chances of having to have the truck towed or it being down. Looks like its leaking where the rubber tube is connected to the metal part so there isn't really a way to repair it. The part is one piece and costs 110 at the dealer. Has anyone else had this issue and fixed it themselves? Truck is a 2010 sierra crew 5.3 with 6l80 and heavy duty cooling which apparently makes this even more expensive of a job.

dsr611 Senior Enthusiast

dsr611

Posted
Posted

Welcome to the club...

http://www.gm-trucks.com/forums/topic/150996-oil-cooler-lines-and-transmission-cooler-lines-leaking/?hl=leak

 

There's another thread on here somewhere that I'm searching for where someone had some lines made up at NAPA, I think, and replaced them with braided lines with compression fittings.

 

Found it...

http://www.gm-trucks.com/forums/topic/156502-transmission-line-leak-2010-gmc-1500/?hl=compression%20fitting

SG Lou Enthusiast

SG Lou

Posted
Posted

My Dad's 2010 Silverado had the same issue. I fixed it, using a Dremel with a cutoff wheel, I cut the crimped aluminum sleeve off, and pulled the hose off of the fitting. the flared portion of the trans line is actually 2 pieces flared and crimped together. Again with the Dremel I cut the flared portion so the lower half could be removed yet still retain the upper half of the flare. Forced the hose back on over the flare and double clamped it. Good as new ( Well Almost ) but to this day it's still holding with no leaks.

karlitos Enthusiast

karlitos

Posted
Posted

As well, dealer quote to repair the leak was approximately $460. I blew it off until a few weeks ago as the line was begining to leak quite a bit. I searched YouTube & found a repair that was pretty easy to follow. I did not cut off the original flares. All I did was cut the rubber tubing and cut off the MFG crimps. I was able to push the new tube over the radiator side flare and use 2 hose clamps. On the tranny side of the tube, I was unable to get the tube over the MFG flare but still used 2 hose clamps. So far, I do not have any leaks. Total cost of the repair was about $25 and about 1/2 day, mainly because I had to walk to AutoZone about a mile away to get a quart of tranny fluid I forgot to purchase prior to performing the repair and I take my time. For me the hardest part was disconnecting and reconnecting the tubing from the radiator. Other than that, not too bad. The OEM crimps are known to leak and if the dealership repairs them, they'll use the same crimped on tube and it will eventually leak, again. This repair solves that. Good luck.

bgbdwlf2500 Enthusiast

bgbdwlf2500

Posted
  • Author
Posted

So i went to advance auto parts and bought the trans hose and some hose clamps. I didn't have tools to be able to save the factory flare so i used my tubing cutters and cut the tubing. I pushed the tubing as far as I could and double clamped both ends. Took it for a test drove and all seems fine, no leaks. If it starts dripping again I'm not worried about that but without a flare would you worry about it blowing off? Everything I could find says the pressure should be low. I couldnt use my hand to twist the New line on the factory line, it was that tight. If it does end up working total cost about 10 bucks. I had a negligible amount of fluid come out, couple ounces at most.

txab Senior Enthusiast

txab

Posted
Posted

Probably fine, but I'd still flare the end just a bit, imo

 

It shouldn't blow off because it is low pressure, seeping would be the main issue

SG Lou Enthusiast

SG Lou

Posted
Posted

So i went to advance auto parts and bought the trans hose and some hose clamps. I didn't have tools to be able to save the factory flare so i used my tubing cutters and cut the tubing. I pushed the tubing as far as I could and double clamped both ends. Took it for a test drove and all seems fine, no leaks. If it starts dripping again I'm not worried about that but without a flare would you worry about it blowing off? Everything I could find says the pressure should be low. I couldnt use my hand to twist the New line on the factory line, it was that tight. If it does end up working total cost about 10 bucks. I had a negligible amount of fluid come out, couple ounces at most.

The next time your under the truck you can possible either file or using course emery cloth rough up the surface of the tubing a bit to give it some bite when the hose is clamped on or as txab said you can add a slight flare to it.

Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted

Agree with txab, if you can flare that would add to the holding of the line to the metal. There are lines out there from the factory that I have seen that have just a hose clamped to the metal line.

 

This set up also makes it easy to do transmission fluid exchanges.

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