700R4 Transmission cooler line thread size...
06-11-2009, 09:25 AM
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Car: 1988 Camaro(92 Z28 clone)
Engine: Forged 383, AFR 195 419/430@wheels
Transmission: Monster 700R4 Yank 3600 stall
Axle/Gears: 9in Detroit locker-3.90's,35 spline
700R4 Transmission cooler line thread size...
Hi all I am hoping that someone knows what the thread size/pitch is for the transmission cooler lines on the 700R4. I am gathering all the parts for my swap and am hung up on this. I would like to run some threaded pipe to AN fittings and run stainless steel braided hose up to the transmission cooler in the front. I just need to know what size they are. Also, what would be a good size hose to run? I was thinking something like a -6. From what I have read the factory lines were what, 3/8ths and a -6 would be very close to that size. Also, I might end up adding a gauge for transmission temperature. If I were to do that, could I just add a AN fitting inline that has a 1/4 NPT fitting for an electric temp gauge and run it in the cooler line coming out of the tranny? Thanks for any info, Paul M
06-11-2009, 05:30 PM
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: 700R4 Transmission cooler line thread size...
Factory fittings are 5/16" inverted flare.
06-11-2009, 07:56 PM
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Car: 1988 Camaro(92 Z28 clone)
Engine: Forged 383, AFR 195 419/430@wheels
Transmission: Monster 700R4 Yank 3600 stall
Axle/Gears: 9in Detroit locker-3.90's,35 spline
Re: 700R4 Transmission cooler line thread size...
Thanks for the reply. I just spent about 20 minutes on jegs.com looking through the fittings and adapters section, and could not find any fittings that were 5/16 inverted flare to -6 AN. Do they even make an adapter fitting specifically for that, or will I have to make something else work? All the adapters that I saw on jegs were converting NPT to AN and the sizes were either 1/4 or 1/8 sizes and no x/16 sizes were listed. Am I looking up the wrong stuff?
06-11-2009, 10:11 PM
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Car: 91 rs, 97 firebird
Engine: 3.1, 5.7
Transmission: both 700r
10-03-2017, 01:46 PM
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Re: 700R4 Transmission cooler line thread size...
10-04-2017, 07:24 AM
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Re: 700R4 Transmission cooler line thread size...
The transmission case is tapped for 1/4" NPT fittings. Remove the lines, remove the adapters, then thread in 1/4" male NPT to -6 AN fittings. Do not over-tighten.
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10-04-2017, 09:23 AM
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Re: 700R4 Transmission cooler line thread size...
that is exactly how I did mine-removed the factory brass fittings from the case to screw in 1/4"NPT -6 fittings.I used a tranny cooler from a ~1993 ford explorer-it had "weird"fittings,so retapped that for 1/4 NPT.Fin density is quite high on the ford cooler,so it has a fan mounted 
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