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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1992-1996 Ford F150

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Old June 22nd, 2014, 04:13 PM
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Default transmission cooler

This has probably been brought before, but, on my '96 F150XLT, I've replaced the rad, and tranny cooler lines, since the old ones broke when removing the old rad. I've used 5/16 brake lines. Problem is when I connected to the tranny cooler, there was a leak. When I tried to tighten the line a touch more, it seems like it stripped and came right out of the cooler.
My questions are, anyone else have this happen? Anyone else use brake lines for tranny lines? And, should there be some more threads protruding out from the large nuts on the tranny cooler where the lines connect?
Any help would be much appreciated.

Old June 29th, 2014, 08:03 AM
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Update, I replaced the tranny cooler, found one at the wreckers for $20. Made a new line and everything works perfect! The 5/16" steel lines work great and for the rubber flex lines I've used some 5/16" I.D. braided line that I got from work. Fits like a glove.
Old August 13th, 2014, 10:40 AM
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How did you make the new lines, does this require a flaring tool? I may need to do something similar on mine.


96 F250 4x4 PSD auto CCSB
D60 axle swap with F350 front springs
SD (B code) rear springs and 4" factory F350 blocks
Explorer grab handles
Remote door locks work with engine running mod.
Link to my D60 refurb and OBS swap thread
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Old August 13th, 2014, 10:50 AM
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a flare is preferred
but most folks don't ream the inside of the tube after cutting and it makes for a bad / leaking connection
plus if doing this in place the flare tool can be a PITA

I have had good results using compression fittings on the trans lines
easy to install and user friendly; I like to put a dab of pipe dope on the ferrel

if needed for a repair you can substitute soft copper tube
it's just hard to find 5/16" OD copper
for which I use a reducing coupling and increase the size of the copper
I only use copper for a repair and only short lengths

now on a brake line - flare only

For Those Who Fought For It...
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Last edited by JSoko; August 13th, 2014 at 10:55 AM.

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1994-f150-bud , ASwaff400 , Booba5185 , dkenny9 , glc , JSoko , leojr , Matthew , mjohansen11 , Ozzie , Russo2 , The Frankster

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