I sprung a leak in the line from the top of the rad back to the tranny on a 4r70w with factory aux cooler .
Im going to re-place all the lines since im there, but want to pump the pan out so I need to know which side of the hole to set up my bucket.

Which way does it flow ? little confusing when looking up parts the way they describe which part is which for what ..inter, outer, lower ....etc

Does it go from the tranny to the rad then the aux cooler back to the tranny ..right?, lower line on the tranny is out ...right?, or does the flow go to the aux cooler first?..that don't seem right



snow

 

If you are looking at the line from the front of the truck the one on the right is the send and the one on the left is the return. If your sitting in the truck the driver side is the send and the passanger side is the return. The flow runs from the trans to the cooler in the rad and then out of the rad into the aux cooler and then back to the trans. Hope this helps.

 

Yes thanks, I thought thats the way it went . Now let's hope those line nuts go ok...started soaking them w/ WD-40 till I get the new lines

snow

 

On my truck, which is a different year, the sending line goes to the top of the radiator, and the return line is from the bottom of the radiator.

 

Mine is the same.

 

I would not sweet it to much,my lines came off easly and I did not use any WD-40. Just make sure when spinning the nut off you dont twist the trans line.

 

Im mostly worried about the ones @the aux cooler(real rusty) and lower rad, can't see that one yet....going to try getting it from the wheel well area.

All the others are not bad looking , Should I use use those fancy line wrenches or will reg box wrench work? .....vise grips plan B
Im not worried about destroying the old lines the rust has done that for me

Going to Napa today and see whats in stock and order the rest ... hopefully I can get this done while we have this nice weather this week .

Oh btw when putting the lines on , is there anything you put on the threads ?

snow

 

On my truck the ones on the aux cooler came off like butter. But the ones on the rad did not go as well. The top one was gravy but the lower was a pita, I just tryed to spin the nut thing that the trans line that went into the rad and ended up twisting the line it self, not good. Also the fan shroud needs to be loosed up and moved out of your way as best as it can. You also might want to think about taking the rad lines off the rad because there is no room in there, I had to in my case but im not in your shoes. Just go in from the bottom through the wheel well, you will need to take those couple of push ins out to get the wheel well liner far enough out of your way. Have some one up top hold on the nut peice that is built into the rad so you dont F up the line. I used all adjustable wrenchs and a pair of bent nose chanel lock, there is just not enough room to fit a wrench. But I guess in your case since you are replaceing everything just cut all the old trans line out of your way and just put sockets on eveything. As far a putting anything on the threads, with I did mine I put a little bit of pipe dope and I mean a little so the threads seat fully. I would just put everthing together dry and just watch for leaks because you dont want anything to get into the trans fluid that is not suposed to be there. The connections to the rad are brass if I remember correctly so nothing realy needed there and the nut on the aux cooler has a rubber seal built into the nut so you should be good.

 

In my experience, whenever there was a special tool, it always seemed to work better than trying to wing it with what I already had. But then again, my tool collection is full of special purpose tools. But you know what they say: "Right Tool For The Job" I have an '07. We tried all sorts of "tricks", but the transmission lines came off with no effort once we got the right special tool.

 

I suppose your right , I have a few specialty tools for the sleds ...some of my own versions that I made up(spring pullers, clutch tools etc.)

I think i'll be buying at least the one for the line nuts for a no slip knuckle buster. Plus it might come in handy for the sled too since it is metric.

The ones im worried about is the radiator ones, I don't want to mess up the rad fittings and that lower one..... Also the longer wrench would help up on the side of the tranny ...after I bend the heatshield out of the way.

My lines should be here in another day or so and then the fun begins...made me a creeper for the job too(2x10 w/ casters). It will come in handy for moving around under there.

Snow