727: Which line is hot (out to radiator) ?
 

Trans cooler should be in tomorrow, wondering which line is the out from transmission line (which I'll call hot), and which is the return (cold). Or, does it even matter for most add-on trans coolers?

The lines are just under the rad, and just have a rubber hose connecting them at the moment. Which one (driver or passenger) is the out (or hot) line from the transmission.

If there is an easier way to reference this, let me know, is one line higher on the 727 that the other, etc?

I've got a new speedometer cable coming this week too, hoping I can work out the lighting issue and drive her a little further than around the block.

Thanks in advance for any replies folks.

You can't install the cooler either before or after the radiator, but I would just bypass the radiator completely. Reason being, you don't want to cool the fluid just to have it heat back up after and you do not want it getting warmer because of the radiator fluid.

I would also install a transmission temperature gauge so that you can monitor the temp. It's just an inline sensor.

I saw the link you posted (in another thread) about the tranny cooler that you got from Summit Racing. That is a good size cooler and I would just run your tranny off of that.

Here is a link to the transmission temperature gauge that I used - http://www.summitracing.com/parts/BMM-80212/

According to the book, the line in the front of the transmission goes to the cooler and the one in the back is the return.

Great! Thanks for the info guys, can't wait to get it going.

No problem! By the way I love that charger! The color is amazing, yet not too flashy!

Well, mark that off the list. Didn't actually connect the lines yet though, since it's about to downpour here and I don't have fluid to put in either. There wasn't anything about a pressure side so I didn't worry about it, though I wonder if hot should go in the bottom since heat rises.

I'm guessing I'll just need to add a little fluid since it added about 60" of line. Related question for you guys, what ATF do you guys run? Recommend? Seems there's a lot of mixed opinion on this, some people think newer fluids can cause problems. So, hoping to get some opinions.


Trivial thing but it's done lol:


Attachment 18877

I don't think it makes any difference which way you run it if it is not specified. Just make sure it is in front so it gets the cooler air. As far as ATF, I just started using Ford type F, The book, as i refer to it, and the shift kit recommended it. It seams to be running better than it did on Dextron. Just my opinion.

This should be a poll,

Amsoil
Type F (Fav brand?)
DEXRON III
Other

Dextron III of B&M Trick Shift for me.

Ended up getting a cheap temp gauge and some fittings to make my own in-line sender. Saved about $23 and don't have to wait for shipping. Nice little indoor project since iI think t's about to pour and I don't like either car to be out when there is a chance for hail.

Just make sure the the front is going to the top of the cooler and the back is the bottom....
Incase we forgot to mention that.
:D

Think of it as a radiator, hot coolant enters at the top of the radiator and returns to the engine from the bottom. Figure which way the trans fluid is flowing and connect the outlet to the top of the cooler and back to transmission thru bottom of cooler

Glad you mentioned it, I was thinking that but wasn't sure.

I realized that my simple in-line temp gauge plan wasn't as solid as I thought, since the sender would be just before the new cooler, I guess it's better than nothing though... I'm starting to go back to the ideal of having it in the pan, I should just go get a new pan and put a grommet in, and have someone weld it. I really didn't want to drain it all though. I guess I'll go ahead and see what kind of readings I get.

If I may I would like to point out a couple more points. First, some one mentioned earlier to bypass the cooler within the radiator, well, there is a reason for it being there actually it serves two purposes one is to cool and the other is to maintain a certain operating temperature. With that said what I would do is install the external (aftermarket) cooler after the outlet on tranny and before the radiator to remove any excessive heat, than route to the cooler with in the radiator to obtain the same temp as engine. Keep in mind although to run a transmissiom to hot is very damaging on the other hand a transmission is suppose to run at a certain temperature that comes from being routed through the radiator. One last point if your installing an inline temp sender I would install on outlet from radiator to transmission (inlet side). This will capture temp after two coolers and before the transmission. I hope I wasnt two confusing.

Scott (the one and only sweeperking)

I'm with you sweeper, but the radiator that's in it doesn't have the hookups. At some point I will probably replace that, but it won't be for awhile yet. Still working on the wiring issues first.

Hey 68lover,

Just making sure you got the right hook up.
The tranny line closest to the engine should be the line going to the top of the tranny cooler and the the line out of the bottom of the cooler should be going to the back tranny connection.....

BTW don't worry about not running through your radiator.
My tranny has only the aftermarket cooler that was installed by a professional shop that gauranteed the tranny for 3 years knowing I would romp on it ALOT.

Front is pressure, back is return, sounds good, thanks for double checking Mopar_71!