Hi all, Welll my project is finally coming back to life. I bought an 89 F150 2WD Custom that was basically a pile of rust with a new JASPER engine and a freshly rebuilt C-6 Tranny. I tore it down to the frame and rebuilt it removing the rust then painting it and replacing anything that looked like it needed it. I got my 4.9L running again last week but the timeing is advanced a little...(not much) she really does run nice especially for a truck that has been in parts for nearly 2 years. My issue right now is my transmission line that goes into my Radiator. The line is 5/16 (and the fitting as well) (I don't know if it is correct though, when I tighten it all the way in the fitting seems to be short (the inlet in the Radiatior is about 1.5 inches (or thereabouts) and the actual line doesnt seem to be held tightly in the fitting and fluid leaks, Originally there was a tranny cooler mounted up front and the line went to it then back out and into the radiator, (right now I have it going straight from the tranny to the radiator) I plan to put a new cooler up front, but am wondering if the line coming ff the cooler is where the correct size fitting is? With a 5/16 line could the fitting actually be 1/4? This isn't a huge problem, but I do need to figure it out. Any help would be greatly appreciated....

 

the oem set up has an oil tube connector going into the cooler fitting and then the steel line goes into the connector with an extra long tube nut that seats against the o-ring in the tube connector.

5/16 is the right size for the line, but the tube nut will actually be 1/2 - 20 and must be long enough to seat against the o-ring to seal. Also the o-ring could be damaged. Sounds like you may not have the oil tube connector?? The cooler fitting should be 1/4 NPTF.

Part E2TZ7D273A Transmission Oil cooler Tube connector
(Automatic Transmission) - All Engines; Includes "O" ring, 1/2 - 20 female x 1/4 NPTF male, for 5/16 diameter tube - still available from ford.

When I went through this earlier this year I couldn't find the right tube nuts locally to save my life so I ended up using two Hayden Transmission Line Adapter Fittings 394 (only the male fittings) and ran rubber lines instead of steel.