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Getting ready to install external trans cooler. Some questions

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GNVAIR

Member
Joined
May 24, 2001
Messages
2,449
I have a B&M stacked plate trans cooler (#70266) that I will be installing this week. I want to keep my stock cooler inline with the external. My main question is what line should I tap into?
Ken Mosher's picture on the www.gnttype.org site shows the top line at the radiator running to the external cooler.
The other outlet on the external is then run to the top fitting on the radiator. It appears as if the lower cooler lines is left untouched.
Is this correct?
 
you only have to disconnect one hard line . and the external is piped in between this . This creates your "loop" or puts the coolers in "series" . I've done a little reasearch and some say hooking up the coolers parallel is far better .
 
I have the top line in mine hooked up . I really do not think it matters if you loop the external cooler into the top or lower hard line . It will just put the fluid coming from the trans into the internal or external cooler first .
 
A friend of mine was a tech at a Ford dealer and he said that when they would do auxiliary coolers they would run the fluid through the auxiliary cooler second. Their thinking was that the fluid would cool more if it ran through the auxiliary second. Not sure why and not sure it matters either.
 
The oil should go through the external cooler first. This does 2 things. It sends cooler oil into the rad cooler making the rad more efficient and the oil going back to the trans is always at a constant temp. This is very important. If you are driving on a cool 40F day you don't want super cool oil going in the trans. The best is to have 160F trans fluid going to the trans all the time.

It seems that all the trans cooler instructions want it piped the other way. :(
 
so , which line is the suppy to the internal ? I would think it would be the bottom . Any problems just running the external only ?
 
The top line is oil coming from the trans. Disconnect this line and remove the union. On the line coming from the trans this should go to the external cooler and the line from the external cooler is attached to the line going into the rad. Done. :D

You could just run just the external but you are back to having too cool oil going back to the trans. Its best to have a constant temp oil going into the trans.
 
got it :) . even with a 9" non/lu , will using only the external create a cool oil return problem back to the trans ? seeing that these converters generate more heat to begin with . Thanks.
 
Tim, There will still be cool oil going back to the trans but it would only have an effect in cold weather in which you don't drive your car in. Come to think of it you don't seem to drive your car much at all! ;) Sorry, I just had to give you a shot. :cool:
Have you driven it at all with some fresh oil in it? Hope to see you at St.Thomas this year.

Tim "D"
 
lol . ins goes on in the some time in mid April/May . If all is well I'll be at St. Thomas ready to go lined up beside yours :D .
 
Tim A
I'm going to run just an external cooler (Largest B&M stacked plate) with some fans on it. I'll let you know what the temps show

Tim D
LOL :) Good shot at Tim.
I may be way off base here... but from what I remember, the B&M coolers are multi-path coolers, and bypass some of the fluid depending on the temp of the fluid (Something to do with the viscoscity) So running "too cool" wouldn't be a problem.

Paul
 
there is a temp by-pass valve that B&M has out . It will by-pass the cooler untill fluid reachs operating temp.
 
Tim, I don't have one I just saw one by B & M . and i agree with you on a valve malfunction . Go way to smoke a trans .
 
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