700r4 cooling line fittings. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

63longfleet · 05-28-2019, 08:20 PM

Ok after hours of searching and reading threads till my eyes hurt im stumped. Every post says that the size of the threaded opening in the case is 1/4". Every fitting i have seen for sale had been 1/4". Well mine aint!! i have the 1/4" fittings out of my powerglide and they will basicly fall all the way into the holes in the case. Also all of the fittings are straight thread, but just by looking mine are not only larger but appear to be NPT tapered thread. Any help with this would be greatly appreciated.
Thanks
Charles

63longfleet · 05-28-2019, 09:04 PM

here is what i have on the case.

**Mr_Rich** · 05-29-2019, 04:51 AM

Save yourself some grief. Go to the dealer parts counter. They have the fittings you need. I have bought replacements when I replaced my 700R4 especially if the threads get chewed up a bit. You'll be able to tighten up those 5/16" double flared cooling lines right up.

**mongocanfly** · 05-29-2019, 04:59 AM

I was thinking they were 5/16"...isn't there supposed to be a adapter there?

**The Rocknrod** · 05-29-2019, 07:48 AM

Originally they were 5/16" OD tube cooling lines, yes there is an adapter for that. The threads are 1/4 NPTS
There are quite a few aftermarket fittings to be had:
ACDelco 8637742
Dorman 800-755
There are 6an adapter fittings as well out there.

**Mr_Rich** · 05-29-2019, 12:45 PM

The only 1/4" NPT port on the 700R4 is the test port on the driver's side of the trans. I think those adapters are too big for 1/4" NPT. But either way, you need the adapters for the cooling lines. I should've called the fittings "adapters" in my prev post.

**The Rocknrod** · 05-29-2019, 01:53 PM

Here is a set for 3/8" lines - https://www.ebay.com/itm/3-8-SCREW-I...frcectupt=true
And here is a set for 5/16" lines - https://www.ebay.com/itm/5-16-SCREW-...frcectupt=true
Same 1/4 Male NPT (may well be 1/4 NPTS) threads.

**Mr_Rich** · 05-30-2019, 03:17 AM

Quote:

Originally Posted by The Rocknrod

Here is a set for 3/8" lines - https://www.ebay.com/itm/3-8-SCREW-I...frcectupt=true
And here is a set for 5/16" lines - https://www.ebay.com/itm/5-16-SCREW-...frcectupt=true
Same 1/4 Male NPT (may well be 1/4 NPTS) threads.

Those are definitely the fittings needed. I guess the conflict in my mind about 1/4" NPT is that I think they are fine thread and these adapters are coarse thread. This should help the OP.

63longfleet · 05-30-2019, 08:41 PM

I must now hang my head in shame. As I originally posted I took the "1/4 inch" adaptors out of my powerglide and they were virtually swallowed by the ports on my 700r4. I am happy, and ashamed, to report the you all were correct. The fittings I need are indeed 1/4" str8 threads. The reason my 1/4" fittings from my powerglide didn't fit is the powerglide doesn't use 1/4" fittings they are 1/8". Thank you all for your help and I'm sorry to be such a dumbass

**The Rocknrod** · 05-30-2019, 09:41 PM

Dont beat yourself up. Just cause you didnt have the info at hand doesnt mean anything at all. 1/4" straight are 1/4 NPS or NPTS. Check the links I posted. You'll be okay. We all learn along the way, I'm learning on this forum every day.

**mongocanfly** · 05-30-2019, 10:16 PM

Haha..we'll forgive you this time....

05-28-2019, 08:20 PM	#1
63longfleet Registered User Join Date: Nov 2014 Location: oklahoma city Posts: 108	700r4 cooling line fittings. Ok after hours of searching and reading threads till my eyes hurt im stumped. Every post says that the size of the threaded opening in the case is 1/4". Every fitting i have seen for sale had been 1/4". Well mine aint!! i have the 1/4" fittings out of my powerglide and they will basicly fall all the way into the holes in the case. Also all of the fittings are straight thread, but just by looking mine are not only larger but appear to be NPT tapered thread. Any help with this would be greatly appreciated. Thanks Charles

05-28-2019, 09:04 PM	#2
63longfleet Registered User Join Date: Nov 2014 Location: oklahoma city Posts: 108	Re: 700r4 cooling line fittings. here is what i have on the case. Attached Images

05-29-2019, 04:51 AM	#3
Mr_Rich Registered User Join Date: May 2006 Location: Santa Maria, Calif. Posts: 781	Re: 700r4 cooling line fittings. Save yourself some grief. Go to the dealer parts counter. They have the fittings you need. I have bought replacements when I replaced my 700R4 especially if the threads get chewed up a bit. You'll be able to tighten up those 5/16" double flared cooling lines right up. __________________ 1989 K1500 Chev. EC Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit. 2009 Hummer H3T 3.7L 5M (sold) 1997 K2500 Chev. EC 7.4L/ 4L80E 2018 Dodge Ram 2500 HD R/C

05-29-2019, 04:59 AM	#4
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,583	Re: 700r4 cooling line fittings. I was thinking they were 5/16"...isn't there supposed to be a adapter there? __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

05-29-2019, 07:48 AM	#5
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: 700r4 cooling line fittings. Originally they were 5/16" OD tube cooling lines, yes there is an adapter for that. The threads are 1/4 NPTS There are quite a few aftermarket fittings to be had: ACDelco 8637742 Dorman 800-755 There are 6an adapter fittings as well out there. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

05-29-2019, 12:45 PM	#6
Mr_Rich Registered User Join Date: May 2006 Location: Santa Maria, Calif. Posts: 781	Re: 700r4 cooling line fittings. The only 1/4" NPT port on the 700R4 is the test port on the driver's side of the trans. I think those adapters are too big for 1/4" NPT. But either way, you need the adapters for the cooling lines. I should've called the fittings "adapters" in my prev post. __________________ 1989 K1500 Chev. EC Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit. 2009 Hummer H3T 3.7L 5M (sold) 1997 K2500 Chev. EC 7.4L/ 4L80E 2018 Dodge Ram 2500 HD R/C

05-29-2019, 01:53 PM	#7
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: 700r4 cooling line fittings. Here is a set for 3/8" lines - https://www.ebay.com/itm/3-8-SCREW-I...frcectupt=true And here is a set for 5/16" lines - https://www.ebay.com/itm/5-16-SCREW-...frcectupt=true Same 1/4 Male NPT (may well be 1/4 NPTS) threads. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

05-30-2019, 08:41 PM	#9
63longfleet Registered User Join Date: Nov 2014 Location: oklahoma city Posts: 108	Re: 700r4 cooling line fittings. I must now hang my head in shame. As I originally posted I took the "1/4 inch" adaptors out of my powerglide and they were virtually swallowed by the ports on my 700r4. I am happy, and ashamed, to report the you all were correct. The fittings I need are indeed 1/4" str8 threads. The reason my 1/4" fittings from my powerglide didn't fit is the powerglide doesn't use 1/4" fittings they are 1/8". Thank you all for your help and I'm sorry to be such a dumbass

05-30-2019, 09:41 PM	#10
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: 700r4 cooling line fittings. Dont beat yourself up. Just cause you didnt have the info at hand doesnt mean anything at all. 1/4" straight are 1/4 NPS or NPTS. Check the links I posted. You'll be okay. We all learn along the way, I'm learning on this forum every day. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

05-30-2019, 10:16 PM	#11
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,583	Re: 700r4 cooling line fittings. Haha..we'll forgive you this time.... __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver



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