Transmission Lines
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Transmission Lines
I have a 1981 F-150 and someone has put a 1978 Ford LTDII C-4 automatic 3 speed in it.I bought the Original 4 speed overdrive (AOD) to put in it to make the drive train original.My question is about the trans. line that goes to the radiator.Does it matter which line hooks up to the top or bottom of the radiator that comes from the transmission?There are 2 lines on the trans.,one over the other.I also would like to sell the C-4 I am taking out of the truck,which works fine.Thanks for any input
Post Fiend
Joined: Feb 2009
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From: Ottawa, Ontario
I think the input line goes at the bottom of the rad, and the output is the top one.
I'm not sure if it makes a difference where they go or not, but my logic on that would be that since the input is the bottom one, the tranny has to push the fluid up, that way it stays abit longer in the cooler rather than just falling through it from the top.
I'm not sure if it makes a difference where they go or not, but my logic on that would be that since the input is the bottom one, the tranny has to push the fluid up, that way it stays abit longer in the cooler rather than just falling through it from the top.
Cargo Master
Joined: Aug 2007
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From: New Zealand
I removed the original AOD from my truck. It was the other way around - hot in the top / cool out the bottom, then on to the auxiliary cooler (if you have one - my truck had a tow package), & back to the transmission.
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which line on the transmission is the out put and which is the input?the lines in the transmission is one over top of the other.and then on the radiator,which is the input and which is the output.I dont have a aux trans. cooler.It is all stock..
Cargo Master
Joined: Aug 2007
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From: New Zealand
The upper port is hot oil leaving the trans, - lower port is cooled oil returning.
The top port on the radiator is hot oil in, bottom port is cooled oil out.
Is it definitely an AOD? Because on the later AOD/E the ports reversed position (hot oil out the bottom port)
The top port on the radiator is hot oil in, bottom port is cooled oil out.
Is it definitely an AOD? Because on the later AOD/E the ports reversed position (hot oil out the bottom port)
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Thanks.It is a AOD 1981 Trans.I would like to put a trans Cooler on it.what is the best way to route the lines?Will a cooler from Autozone be as good as any?
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Post Fiend
Joined: Feb 2009
Posts: 8,005
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From: Ottawa, Ontario
Hot line from tranny to radiator cooler - out radiator cooler - to Aux cooler - from Aux cooler back to tranny is how you do it.
I got 2 from Autozone, mine are the biggest they sell, witch is 11x11x3/4" and it is a stacked designed (same thing as an engine radiator), if you don't tow anything, you don't need to get the biggest one, but make sure it's at least bigger than ~6x6 and make SURE it's a stacked plate design, NOT a tube and fin.
I got 2 from Autozone, mine are the biggest they sell, witch is 11x11x3/4" and it is a stacked designed (same thing as an engine radiator), if you don't tow anything, you don't need to get the biggest one, but make sure it's at least bigger than ~6x6 and make SURE it's a stacked plate design, NOT a tube and fin.
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