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Old 10-16-2007, 07:03 AM
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Tranny Lines

I am going to make up a set of braided steel cooling lines for my '79 F-body.
Th350 tranny and am going to run an external cooler. What size are the fittings on the tranny? I seem to be getting conflicting information regarding the size......either 1/8 or 1/4. Can anyone help here. Also suggestions on a good cooler would be welcome as well.

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Old 10-16-2007, 06:21 PM
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The threaded holes in the case are 1/4" pipe thread. The brass adapter that is threaded into the case for factory cooler lines is 5/16" tube.
If you change to an AN style fitting, get the correct size for the hose and 1/4" male pipe thread to fit the case. DO NOT OVERTIGHTEN THE CASE FITTING!! This will lead to a cracked case and general unhappiness. Use thread sealer (teflon paste) not thread tape (teflon tape) as the tape will expand into the threads, multiplying the case cracking issue. Using teflon paste and tightening just past snug with a wrench will yield success.
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Old 10-16-2007, 07:01 PM
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A th350's cooler lines arnt under all that much pressure.

20lbs Maybe.

A cheaper alternative is to go to a hydraulic shop and have them make you up some hoses.

Also Hydraulic JIC 37* flare fittings (the most common on light equipment) are the same as AN fittings.

1/4" would be -4 AN and your local Hydraulic shop should have adapters to go from 1/4" pipe to -4 JIC. However if your cooler has 45* flare fittings (what the original cooler lines were it may be harder to find ends for the hoses, or adapters.
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Old 10-16-2007, 07:27 PM
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I think he is looking for nice not CHEAP, cheap is not a + (plus), that being said you will need a pipe too AN fitting on the tranny , easy part to find, I have this on my hotrod and the AN fitting size is #6, dittos on the over tightening . As to the cooler depending on the brand you would need the same type of fitting for conversion to hook up the lines there.
http://www.speedwaymotors.com/p/971,...-Adaptors.html
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Old 10-16-2007, 08:11 PM
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As Pepi states, -6 is an appropriate size.
T350 cooler pressure is NOT 20 PSI, more like 45-80 PSI depending on engine RPM. Do not forget the lines must handle heat and pressure. Torque converters can and will produce temps exceeding 280 degrees when under load. This is the oil temp being delivered to the cooler via your new lines. Be sure the line can handle hi temp and pressure...
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Old 10-16-2007, 09:11 PM
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Chazmac........

Are the fittings the same from the 350 to the 700r? Reason I ask is I was told the 700 was 1/4 pipe thread but on mine, the threads were straight and the fitting boss was slightly tapered and sealed against the case. I have a picture somewhere! LOL Just curious.

Mark

Ah,, found em.



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Old 10-17-2007, 03:00 PM
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Tranny Lines

Thanks for all the replies. The fittings look the same as in the last post, but I am going to use the ones in mine. Looks like I found some parts that will work, Ill post the lines when I get them assembled. I am using Black braided lines and stainless fittings used for power steering lines for commercial tractors. 2200 psi working pressure, and tough enough to hang out by a turbo all day, so I think they'll do the job. They look all business too!
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Old 10-18-2007, 04:53 PM
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yep the fittings in the tranny are not taper pipe fittings. They are a parallel pipe fitting.

I always use a 1/4" parallel pipe Oring to -6 Jic connector on the tranny and run 2000 Psi hydraulic hose to the cooler, which "most" of the time has AN fittings on it, however some do not. But its no big deal to cut the fittings off and braise on some -6 JIC ends.
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Old 10-18-2007, 05:36 PM
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Trans lines

If temp. is a concern, why not install a small cooler as close as possible to the trans. which line is the pressure and which is the return lines. ( top or bottom on the trams.) I onces saw a stainless steel line which was a loop of maybe 2 feet long with no cooler. It worked great, altho I don't know how long it lasted, but it was driven on the streets for over a year.
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