Trans Cooler Line Fitting Size - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71meangreenc10 · 09-16-2011, 04:15 PM

Anyone know off hand what the thread size for the trans cooler lines going into the radiator is? Is it a fine thread or pipe thread?

Thanks

Smitty

Dunenutt · 09-16-2011, 04:33 PM

I believe it is 3/8 flare. I know it's flare. You can get the pre made lines a any auto parts store, in the brake line area.

**john** · 09-16-2011, 05:05 PM

5/16" inverted flare nut.

71meangreenc10 · 09-18-2011, 11:39 AM

Where could I find a tap and die to clean one up (also need to fix the radiator threads)???

Smitty

71meangreenc10 · 09-18-2011, 06:24 PM

TTT

Smitty

rpmgroup · 09-19-2011, 12:14 AM

I have had to get a couple of 5/16 inverted flare nuts or plugs from the local auto parts store. used my die grinder with a cut off disc to cut a few reliefs across the threads at a slight angle (so it looks like a tap) and threaded it into the holes. this worked to clean up the threads that would not let my lines start.

09-16-2011, 04:15 PM	#1
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,179	Trans Cooler Line Fitting Size Anyone know off hand what the thread size for the trans cooler lines going into the radiator is? Is it a fine thread or pipe thread? Thanks Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 69 C30 Former Motor Home, Flat Bed time 70 G20 Red-E-Kamp Conversion "I'm your Boogy Van"

09-16-2011, 04:33 PM	#2
Dunenutt Newbee Join Date: Jan 2010 Location: Phoenix, Arizona Posts: 1,406	Re: Trans Cooler Line Fitting Size I believe it is 3/8 flare. I know it's flare. You can get the pre made lines a any auto parts store, in the brake line area. __________________ My Build, http://67-72chevytrucks.com/vboard/s...58#post4464158

09-16-2011, 05:05 PM	#3
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Trans Cooler Line Fitting Size 5/16" inverted flare nut. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

09-18-2011, 11:39 AM	#4
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,179	Re: Trans Cooler Line Fitting Size Where could I find a tap and die to clean one up (also need to fix the radiator threads)??? Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 69 C30 Former Motor Home, Flat Bed time 70 G20 Red-E-Kamp Conversion "I'm your Boogy Van"

09-18-2011, 06:24 PM	#5
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,179	Re: Trans Cooler Line Fitting Size TTT Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 69 C30 Former Motor Home, Flat Bed time 70 G20 Red-E-Kamp Conversion "I'm your Boogy Van"

09-19-2011, 12:14 AM	#6
rpmgroup Registered User Join Date: Nov 2009 Location: so cal Posts: 97	Re: Trans Cooler Line Fitting Size I have had to get a couple of 5/16 inverted flare nuts or plugs from the local auto parts store. used my die grinder with a cut off disc to cut a few reliefs across the threads at a slight angle (so it looks like a tap) and threaded it into the holes. this worked to clean up the threads that would not let my lines start.



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