Author Topic: threads on c-6  (Read 731 times)

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Stangman

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threads on c-6
« on: July 16, 2018, 05:34:45 PM »
Looking to upgrade tranny cooler. What size thread is on the in and outlet of the tranny, looking to run a/n fittings
I am not near car now to check, I thought it was 1/8 inch npt but now Im not sure

Drew Pojedinec

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Re: threads on c-6
« Reply #1 on: July 16, 2018, 09:20:51 PM »
Yup. 1/8 npt.

Stangman

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Re: threads on c-6
« Reply #2 on: July 16, 2018, 10:12:06 PM »
Thanks Drew I knew you would see this thanks. Do you think #4 or 6 a/n. I have 6 but if 4 I will get it
« Last Edit: July 16, 2018, 10:29:57 PM by Stangman »

thatdarncat

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Re: threads on c-6
« Reply #3 on: July 16, 2018, 10:27:25 PM »
I'm away from all my stuff at the moment, but if I remember I think there might be a difference between early & later C6's. I seem to remember the earlier ones having a small o-ring sealing the fitting to the case, then I think Ford changed to the NPT fitting.
Kevin Rolph

1967 Cougar Drag Car ( under constuction )
1966 7 litre Galaxie
1966 Country Squire 390
1966 Cyclone GT 390
1968 Torino GT 390
1972 Gran Torino wagon
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Stangman

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Re: threads on c-6
« Reply #4 on: July 16, 2018, 10:31:13 PM »
Not sure what year tranny it is, for some reason I’m thinking 66
« Last Edit: July 16, 2018, 10:45:40 PM by Stangman »

Drew Pojedinec

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Re: threads on c-6
« Reply #5 on: July 17, 2018, 06:48:18 AM »
Hadn’t run into the o ring seal.
I run -6 for trans cooler lines. If nothing else it is very easy to route.

Pentroof

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Re: threads on c-6
« Reply #6 on: July 17, 2018, 09:07:41 AM »
For what it's worth, metal lines will give a fair bit of cooling capacity to the system over braided Teflon or similar. I use 5/16 NiCopp. 10 feet of additional cooling.
Jim

Falcon67

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Re: threads on c-6
« Reply #7 on: July 17, 2018, 10:54:49 AM »
I would look at your trans.  Most should be 1/4 NPS with an o-ring or washer - NOT NPT.  If you force a NPT thread into the case you may crack the case.  The o-ring fitting will seal just fin, better than any NPS.  You can find -6 AN NPS washer fittings at Summit.

https://www.summitracing.com/parts/rus-640520

I used to make -6AN o-ring fittings for C4s.  All my C4s use -AN lines, much nicer and easier to manage than any steel lines.

Stangman

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Re: threads on c-6
« Reply #8 on: July 17, 2018, 03:20:53 PM »
Just so everyone knows the thread is nspt. My fittings on the tranny dont have washers but
the a/n fittings do.That being said I forgot to ask him if all c-6s have that thread. I will check that out
but Im at work now.

thatdarncat

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Re: threads on c-6
« Reply #9 on: July 17, 2018, 03:22:54 PM »
The Ford Parts Book would specify what it is and the fittings, I'm just nowhere near my books.
Kevin Rolph

1967 Cougar Drag Car ( under constuction )
1966 7 litre Galaxie
1966 Country Squire 390
1966 Cyclone GT 390
1968 Torino GT 390
1972 Gran Torino wagon
1978 Lincoln Mk V

Stangman

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Re: threads on c-6
« Reply #10 on: August 06, 2018, 10:30:42 PM »
Well after checking 2 of my C-6s and had two 1/4 inch nspt fittings, I ordered the right ones and
as usual I took the fitting out of the tranny in the car and it’s 1/8 nspt. I tell ya sometimes you just can’t win. So I’m just posting this so we know it could be 1 of 2 different fittings.

Rory428

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Re: threads on c-6
« Reply #11 on: August 07, 2018, 01:01:51 AM »
I don`t recall the exact sizes, but when I ran a C6 in my Fairmont, I used 75 or 76 PU truck C6 cores, which had smaller fittings than my older 66-69 C6s.
1978 Fairmont,FE 427 with 428 crank, 4 speed Jerico best of 9.972@132.54MPH 1.29 60 foot
1985 Mustang HB 331 SB Ford, 4 speed Jerico, best of 10.29@128 MPH 1.40 60 foot.
1974 F350 race car hauler 390 NP435 4 speed
1959 Ford Meteor 2 dr sedan. a;; stock 332 2 barrel2 speed FordOMatic

thatdarncat

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Re: threads on c-6
« Reply #12 on: August 07, 2018, 02:17:11 PM »
I'm back home from my travels and had a chance to look in the Ford Parts Book today - Per Ford the early C6's ( I'm going across all engine families here ) from the 1966 model year until about the 1969 model year used the 1/4-18 thread fitting. Then starting around the 1969 model year some of the cases started using the 1/8-27 thread, and some kept using the 1/4-18, I see an application for the 1/4-18 thread up through the 1972 model year. From the '73-'76 model years it looks like they all use the 1/8-27 thread, but then starting in the '77 model year to at least '79 they start using the 1/4-18 again. I don't have the Ford Parts Books after the '79 model year so I don't know if the 1/4-18 thread continued to the end of C6 production. So there are two possibilities, but it's really a mix when they were used. I didn't check every application, but my quick observation was that Ford specified an o-ring on all of them. 
Kevin Rolph

1967 Cougar Drag Car ( under constuction )
1966 7 litre Galaxie
1966 Country Squire 390
1966 Cyclone GT 390
1968 Torino GT 390
1972 Gran Torino wagon
1978 Lincoln Mk V

Stangman

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Re: threads on c-6
« Reply #13 on: August 07, 2018, 10:47:38 PM »
While we are on tranny’s which port is the one that the fluid flows out
of the front or the back. Running the cooler and I want the fluid to go in the top.

cattleFEeder

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Re: threads on c-6
« Reply #14 on: August 08, 2018, 06:40:11 AM »
I believe the front is pressure the rear port is return. Just take a guess its 50/50 chance right.
Remember, RPM is your friend