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Old 02-03-2006, 09:03 AM
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NPT for 700R4

Folks,

What is the NPT for the two lines coming off the transmission for cooling purposes?
Dutch
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Old 02-03-2006, 10:40 AM
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They aren't NPT, they're flare and I don't know the size. Not inverted flare like brake line, but regular flare kinda like a propane fitting.
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Old 02-03-2006, 01:46 PM
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The upper is the return line or "in, the lower is the out line, and both are inch NPT pipe fittings in the transmission case almost all the time the factory installed a brass 45 degree flare fitting of the same size.

TCI's website containing this information lists ALL common transmissions as having either the 1/8 OR inch pipe threads for these fittings.
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Old 02-03-2006, 02:37 PM
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Hmm, both my 350's and my 700 have fiber gaskets under the brass fittings. Interesting.
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Old 02-03-2006, 02:51 PM
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All of mine are flare. Period. If you pull the extension fitting out, its flare too. The case is machined with a 45* flare right in it.

Must be different by year or application, but mine are definitely flare.
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Old 02-03-2006, 03:18 PM
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Well, I stand corrected! Mine is neither! LOL
Just pulled one of the fittings from my '90 700r. What I assumed he was refering to was the actual hole in the case, not the fitting thats in the case.
One mine, the threads on the trans part of the fitting are straight, not tapered. The hole in the trans goes way in, no taper, no flare inside.
There is also a very slight bevel on the back of the fitting that I can only guess does the sealing against the case. The inside of the removeable fitting is flare, where the actual trans line screws in. You can see the shiny part on the trans side of my fitting where it seals to the case.

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Old 02-03-2006, 03:47 PM
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Jmark,

Yes, I wanted the NPT size for threading into the transmission case.
From there, I can determine what I will use to conect lines to my cooler.

However curtis, what is the AN for flare size for you fittings, 6 or 8 or ?

Thanks for all the help folks.

Dutch
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Old 02-03-2006, 04:30 PM
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Hi Dutch, well, from my trans, a pipe fitting would not work as the threaded hole in the trans goes straight in, not tapered. Its also highly likely that its metric threads too. The fitting threads look very coarse to me.
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Old 02-03-2006, 08:21 PM
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Its not AN flare. AN is 37.5 degrees. This is 45 degrees. I'll have to measure tomorrow if I can (but its installed so it'll take me a while to get the time) and I'll measure it.

The part that threads into the case looks like a smaller version of a propane fitting. Without seeing it in front of me, I'd guess 1/2" thread of some sort, but I'll measure. I don't have a digital camera right now but I'll measure and make a drawing or something.
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Old 02-03-2006, 10:00 PM
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Ive replaced the brass flare fittings with 1/4" NPT fittings for the cooler lines all the time in 700s. Direct match? No but with some sensible installation and application of teflon tape/dope I havent had any leaks yet.
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