4L80e Cooling Lines to Radiator - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1971Stepside** · 01-10-2019, 05:24 PM

Can someone help me with sizes or part numbers for the two fittings on the transmission and what I need at the radiator? My radiator has 5/16 female ports for the transmission. I intend to use Russel braided 6an line for the plumbing. Thank you in advance! I don't have a local store that sells these fittings, so I have to order them and get it right the first time.

sprint_9 · 01-10-2019, 07:38 PM

5/16 line uses a 1/2 x 20 nut.

https://www.holley.com/products/plum...ts/AT991946ERL

On the 4l80 it looks like there is a fitting with a piece of pipe, might want to pull your old ones out and see if yours does have that pipe on it. The Russel page had both types on it at the bottom.

http://www.russellperformance.com/mc/driveline/

**1971Stepside** · 01-10-2019, 10:27 PM

Thanks Sprint. I don’t have the stock ones. My trans came with plastic caps on all the holes

Wildkarde · 01-10-2019, 11:09 PM

The later 4l80s use the fitting with the short piece of pipe, like 97 or later. Ther earlier ones are just 2 of the smae fitting, 1/4 NSP.

These fittings should work for the newer. https://www.summitracing.com/parts/icb-551124/overview/

They have the same set without the tube if you do have an older case as well.

**First c10** · 01-11-2019, 03:58 PM

I used Powerflex on my transmission lines. all -6an to the radiator cooler and Hayden trans cooler.

http://www.russellperformance.com/mc...owerflex.shtml

Start at post 593 in my build thread

http://67-72chevytrucks.com/vboard/s...659275&page=24

**1971Stepside** · 01-11-2019, 06:24 PM

That looks great First c10. Do you know the part numbers for the fittings that you used? The 90's and the ones for the transmission specifically. I like the idea of the PTFE line over the standard line, but I have a hard time finding fittings for it on Summit.

I am going to try to go without the trans cooler as I will not be towing or driving this truck that much. Hopefully fine on just the radiator cooler.

I appreciate the help!

**First c10** · 01-11-2019, 06:31 PM

I am not sure where I ordered them from as I try and order by the actual part numbers i check on Amazon, Summit, Jegs, ebay, etc. whoever is cheaper
below is a link to the powerflex fitting part numbers
http://www.russellperformance.com/mc...owerflex.shtml
Glad I could help!! My trans is a 4L60E so I figures a small cooler would not hurt!
Scott

**First c10** · 01-11-2019, 06:50 PM

OK so I re-read your last post and you were wondering what the part number for the actual transmission to AN fitting numbers were. My transmission is a 4L 60. Below is on eBay link to the 4L 80 fittings. But I do believe there are different years so you will need to make sure they fit.
https://rover.ebay.com/rover/0/0/0?m...2F143060505468

**1971Stepside** · 01-11-2019, 08:36 PM

Thank you! I dug around n Summit and think I found the Russell fittings for mine.

01-10-2019, 05:24 PM	#1
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	4L80e Cooling Lines to Radiator Can someone help me with sizes or part numbers for the two fittings on the transmission and what I need at the radiator? My radiator has 5/16 female ports for the transmission. I intend to use Russel braided 6an line for the plumbing. Thank you in advance! I don't have a local store that sells these fittings, so I have to order them and get it right the first time. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

01-10-2019, 07:38 PM	#2
sprint_9 Registered User Join Date: Nov 2012 Location: 9 Posts: 862	Re: 4L80e Cooling Lines to Radiator 5/16 line uses a 1/2 x 20 nut. https://www.holley.com/products/plum...ts/AT991946ERL On the 4l80 it looks like there is a fitting with a piece of pipe, might want to pull your old ones out and see if yours does have that pipe on it. The Russel page had both types on it at the bottom. http://www.russellperformance.com/mc/driveline/

01-10-2019, 10:27 PM	#3
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: 4L80e Cooling Lines to Radiator Thanks Sprint. I don’t have the stock ones. My trans came with plastic caps on all the holes __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

01-10-2019, 11:09 PM	#4
Wildkarde Registered User Join Date: Mar 2018 Location: Ardmore Posts: 100	Re: 4L80e Cooling Lines to Radiator The later 4l80s use the fitting with the short piece of pipe, like 97 or later. Ther earlier ones are just 2 of the smae fitting, 1/4 NSP. These fittings should work for the newer. https://www.summitracing.com/parts/icb-551124/overview/ They have the same set without the tube if you do have an older case as well.

01-11-2019, 03:58 PM	#5
First c10 Senior Member Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	Re: 4L80e Cooling Lines to Radiator I used Powerflex on my transmission lines. all -6an to the radiator cooler and Hayden trans cooler. http://www.russellperformance.com/mc...owerflex.shtml Start at post 593 in my build thread http://67-72chevytrucks.com/vboard/s...659275&page=24 __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

01-11-2019, 06:24 PM	#6
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: 4L80e Cooling Lines to Radiator That looks great First c10. Do you know the part numbers for the fittings that you used? The 90's and the ones for the transmission specifically. I like the idea of the PTFE line over the standard line, but I have a hard time finding fittings for it on Summit. I am going to try to go without the trans cooler as I will not be towing or driving this truck that much. Hopefully fine on just the radiator cooler. I appreciate the help! __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

01-11-2019, 06:31 PM	#7
First c10 Senior Member Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	Re: 4L80e Cooling Lines to Radiator I am not sure where I ordered them from as I try and order by the actual part numbers i check on Amazon, Summit, Jegs, ebay, etc. whoever is cheaper below is a link to the powerflex fitting part numbers http://www.russellperformance.com/mc...owerflex.shtml Glad I could help!! My trans is a 4L60E so I figures a small cooler would not hurt! Scott __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

01-11-2019, 06:50 PM	#8
First c10 Senior Member Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	Re: 4L80e Cooling Lines to Radiator OK so I re-read your last post and you were wondering what the part number for the actual transmission to AN fitting numbers were. My transmission is a 4L 60. Below is on eBay link to the 4L 80 fittings. But I do believe there are different years so you will need to make sure they fit. https://rover.ebay.com/rover/0/0/0?m...2F143060505468 __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

01-11-2019, 08:36 PM	#9
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,928	Re: 4L80e Cooling Lines to Radiator Thank you! I dug around n Summit and think I found the Russell fittings for mine. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."



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