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post #1 of (permalink) Old 11-14-2003, 02:01 PM
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Should Novice Replace Trans. Line?

I just noticed I have a leak in one of my transmission lines (the one closer to the pass. side of truck) and am wondering of this is a job for a novice. The truck is a 1994 GMC Sierra with 350 and overdrive automatic. I can see clearly where the line is dripping and it is not coming from another source.

I know sometimes the fittings can be tricky and will leak if not done correctly. Are they hard to reach on either end? Any tricks or special tools required?


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post #2 of (permalink) Old 11-14-2003, 04:42 PM
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Re: Should Novice Replace Trans. Line?

THE trick with fittings on tubing is to get the end exactly in line with where it's gonna be by bending a little at a time till it starts to thread easily by hand if it's not starting by hand then fiddle with it some more. Using a wrench to start it will often cause it to cross thread.
If you have to replace one line you might as well do both. Hook them to the trans first as that end is way tougher to hook up than the rad end. DON'T leave the lines close to the exhaust manifold and after they are in shake them from several points and if the vibrate against each other or any part of the truck then that is where they will likely wear a hole and leak in the future. If they rub on the frame or susp they will wear there as well.
Finally for the good news. Check the fittings as they may just be loose. I have personally has a "leaky line" that turned out to be the dipstick not being seated fully in it's grommet. A gentle tap with a sledge hammer(instead of a heavy hit from a small one which would mushroom the tube)on the end fixed this. Once I also had a bare spot on the pos batt cable arc against the line and burn a hole. Talk about a fire hazard. Yeah I bought a new cable.

Good luck.
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post #3 of (permalink) Old 11-14-2003, 06:22 PM
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Re: Should Novice Replace Trans. Line?

The line appears to be dripping from a point in the middle, not dripping down from the fitting. The line goes back not forward to the radiator.

I can't imagine how to get a wrench up to where it connects to the tranny...
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