Off of my c6 are two hookups to the radiator for cooling purposes; I want to install a tranny cooler but don't know which hookup is the input and which is the output ? The tranny cooler has two hookups also. Anyone know which hookup from the tranny goes to what on the tranny cooler and then to the radiator. Then from the radiator to the tranny cooler ?? Sorry if I sound confused.....I am !

thanks,
mark

 

The front line should be the out line; double check by removing it and have someone start your truck and you should see the ATF discharge. Assuming that is right, this discharge line goes back into the radiator cooler. The other end of the radiator cooler connects to the auxiliary cooler and then returns to the in line back to the transmission to form the loop.

Lee
1965 F100 short box styleside

 

Lee I read the post and was wondering if it would make any real fifference to which side of the tranny and cooler/radiator the lines were connected to??

John
jowilker

66 F100s
In the still cool hours of the night, you can hear chevys rusting away.

 

Maybe it depends, like the prez, on your definition of 'real difference'. What I gave was how the cooler manufacturer detailed the circuit as well as the trans shop rebuilder; he was very adament about the routing. I didn't ask why (this time) but you definitely need to push the fluid thru the radiator first, the cooler second, then back to the trans. My hunch is that the routing covers all situations in North America and climate extremes make it more and more important. Our forum friends in San Diego could probably route it backwards and it wouldn't make a 'real difference'.

Lee
1965 F100 short box styleside

 

Lee, I must have missed the third piece. My thought was, If you have just converted to auto tranny and your radiator has a couple plugs for tranny lines to connect to. Does it matter on the front/back to left/right hookup? Is there any flow pattern in the cooler, and isn't the tranny pumping the fluid?


John
jowilker

66 F100s
In the still cool hours of the night, you can hear chevys rusting away.

 

There is no flow pattern to either the radiator or auxiliary cooler, just pick the shortest route to keep the line length at a minimum. But if you insist, you can run the longest route too, but why? If you happen to be using a cross-flow radiator, then connect the out line of the transmission to the bottom connector. And yes, the transmission pumps, or pushes, the fluid out of the transmission to the cooler apparatus.

Lee
1965 F100 short box styleside

 

OK so there isn't a wrong way to do it. I think I used equal length tubes when I did mine. The front tranny went to the drivers side of the radiator and the passender side went to the rear.

Thanks

John
jowilker

66 F100s
In the still cool hours of the night, you can hear chevys rusting away.

 

Hi all...doing the same to mine soon...here is something to think about in regards to the routing. Basically what we are running is a heat exchange system. When you do that you want to cool it in steps. Now, when driving, your radiator will be at a higher temp than your trans cooler. So, you want the hottest fluids coming out of your trans and then getting cooled down some. Then by going on to the tranny cooler it will be cooled down even further and then back to the tranny... If you did it the opposite way you would be heating up the fluid going from the tranny cooler to the radiator and then back to the tranny... In my opinion not what I want... Hope this helps and this is probably why the guy at the transmission shop was adamant about it... Good luck, Rick

 

ok from what I've heard, the routing you suggested (radiator then the aux. cooler) is the best way to get the fluid as cool as possible, however I've also heard that in cooler climates, it can be desirable to route through the auxilarly cooler, then back through the radiator so that the fluid doesn't become too cool. Trans fluid just like anything else has an ideal operating temperature (don't quote me on this, but I belive it's in the neighborhood of 180-200) If you lived in a cold climate, it may actually be possible to pull too much heat out of the fluid so that it's below it's ideal temperature. I don't know what problems this could cause, if any, but just something I've heard. I personally have completely bypassed the radiator, & have a 16 pass cooler with a built in electric fan on mine, but I'm also in the desert, & 90% of the time the trucks running, it's in 4-low

1978 Ford F250 Supercab, Altered Wheelbase, Modified Skyjacker lift, D60s, Lockrights, 4.88s, 4WDB, 15/42x15 TSLs on 15x10 Arizona Wheel Chrome Wagon Wheels w/ R.B. Ent beadlocks, 351M/C6/205

 

After the engine is warmed up to operating temp, get under radiator and feel the two lines, the warmest one will be the input line to radiator.Splice in to the coolest line(return line to radiator) for a line cooler.
I used the perma-cool frame rail type cooler.It's 24" long, very thin and mounted under the radiator support for maximum efficiency, and air flow.
After the raiator has done its best to cool the fluid, I think it is best to put the cooler to work where the fluid is on its way back to tranny!!!




SEANSTER 77' F150 XLT 2WD 400 C6
Edel.cam,intake
WEBER 625cfm 4bbl

 

After the engine is warmed up to operating temp, get under radiator and feel the two lines, the warmest one will be the input line to radiator.Splice in to the coolest line(return line to tranny) for a line cooler.
I used the perma-cool frame rail type cooler.It's 24" long, very thin and mounted under the radiator support for maximum efficiency, and air flow.
After the raiator has done its best to cool the fluid, I think it is best to put the cooler to work where the fluid is on its way back to tranny!!!




SEANSTER 77' F150 XLT 2WD 400 C6
Edel.cam,intake
WEBER 625cfm 4bbl