6R80 Cooling lines
Tuned
Joined: Dec 2012
Posts: 429
Likes: 112
The pump pressure is not relevant to the coolant lines. Your 50 is closer than my single digit, but it's still well within hose barb and clamp range.
https://www.ford-trucks.com/forums/1...l#post18967782
https://www.ford-trucks.com/forums/1...l#post18967782
Pressure has to do with volume and restrictions. The orifice tip of your pressure washer actually creates the pressure. Take the nozzle off a pressure washer, and it becomes a garden hose. Put the nozzle on and the pump can force that same volume thru the tiny hole. Not so much for the garden hose. I have an adapter for pressure washer tips and it creates a nice strong mister, at 80PSI or so.
Lets say those lines move huge volume. 13 quarts can be gone in notime. The cooler creates some restriction as well as the tubing. So 30-50 sounds very fair. But yes, almost any line that says "Transmission" would be in that factor of safety. The 400psi rating on mine is probably way overkill, but maybe some racing or towing applications have elaborate cooling that creates lots of backpressure.
Laughing Gas
Joined: Feb 2005
Posts: 784
Likes: 26
You can theorize all you want, and you can disagree with Mark Kovalsky all you want, but before you do, maybe you can tell us how many years of experience you have working for Ford as a transmission engineer, so we can all ooh and ahh and recognize your superior expertise on the subject.
Tuned
Joined: Dec 2012
Posts: 429
Likes: 112
You can theorize all you want, and you can disagree with Mark Kovalsky all you want, but before you do, maybe you can tell us how many years of experience you have working for Ford as a transmission engineer, so we can all ooh and ahh and recognize your superior expertise on the subject.
The whole idea of cooling is to circulate it quickly.
Laughing Gas
Joined: Sep 2020
Posts: 874
Likes: 157
The cooler is cooling the pool outside the main river flow. Its seeing nowhere near the couple hundred psi the transmission is circulating
However the cooler lines are circulating enough fluid that a severly leaking line will drain the trans to sever damaging levels in in virtually seconds. That is why its so important.
Say your towing that 10k camper that should never be behind a f150 your in 4th gear doing 80 foot through the floor board. transmission and coyote are going for all there worth.
then suddenly the tach quivers steadies you think you imagined wait you were texting didnt even notice 30 seconds go by and the tach screams losing speed you pull over camper coverd in 16 quarts of transmission fluid.
Wife looking at you pissed 3 kids screaming in the back seat. Looking at a 7000-10k repair bill plus.
you could repair it cheaper. Though now is the time to upgrade in preparation for twin turbos
However the cooler lines are circulating enough fluid that a severly leaking line will drain the trans to sever damaging levels in in virtually seconds. That is why its so important.
Say your towing that 10k camper that should never be behind a f150 your in 4th gear doing 80 foot through the floor board. transmission and coyote are going for all there worth.
then suddenly the tach quivers steadies you think you imagined wait you were texting didnt even notice 30 seconds go by and the tach screams losing speed you pull over camper coverd in 16 quarts of transmission fluid.
Wife looking at you pissed 3 kids screaming in the back seat. Looking at a 7000-10k repair bill plus.
you could repair it cheaper. Though now is the time to upgrade in preparation for twin turbos
Last edited by Evan76; May 17, 2026 at 10:36 AM.
Tuned
Joined: Dec 2012
Posts: 429
Likes: 112
The cooler is cooling the pool outside the main river flow. Its seeing nowhere near the couple hundred psi the transmission is circulating
However the cooler lines are circulating enough fluid that a severly leaking line will drain the trans to sever damaging levels in in virtually seconds. That is why its so important.
Say your towing that 10k camper that should never be behind a f150 your in 4th gear doing 80 foot through the floor board. transmission and coyote are going for all there worth.
then suddenly the tach quivers steadies you think you imagined wait you were texting didnt even notice 30 seconds go by and the tach screams losing speed you pull over camper coverd in 16 quarts of transmission fluid.
Wife looking at you pissed 3 kids screaming in the back seat. Looking at a 7000-10k repair bill plus.
you could repair it cheaper. Though now is the time to upgrade in preparation for twin turbos
However the cooler lines are circulating enough fluid that a severly leaking line will drain the trans to sever damaging levels in in virtually seconds. That is why its so important.
Say your towing that 10k camper that should never be behind a f150 your in 4th gear doing 80 foot through the floor board. transmission and coyote are going for all there worth.
then suddenly the tach quivers steadies you think you imagined wait you were texting didnt even notice 30 seconds go by and the tach screams losing speed you pull over camper coverd in 16 quarts of transmission fluid.
Wife looking at you pissed 3 kids screaming in the back seat. Looking at a 7000-10k repair bill plus.
you could repair it cheaper. Though now is the time to upgrade in preparation for twin turbos
From what I've seen on the Valve body there is a thermostat and an orifice that may divert 10% of the fluid and reduce (but not eliminate) pressure. That large amount of volume creates that 30psi ish of pressure. NOT the 300PSI to move clutches.To get the 300PSI the fluid would pass thru very tiny orifices,and the pump is up for it. But technically the NAPA lines could handle it.
Laughing Gas
Joined: Sep 2020
Posts: 874
Likes: 157
Its not 300 psi. I do not k ow the actual trans pressures but its doubt 300. Also dont know how much is going through cooler lines. Would be cool to bypass cooler and see its affect on coolant temp in the pan.
Trans is kinda my area up grading. Been thi king about a finned pan for mine along with being able to monitor temp. Not that it needs it, thats just what i do.
When i did lead frame i was impressed that the frictiins looked as good as they do. Though i dream of gpz frictions lol
Getting sidetracked with thus badass transmission
Trans is kinda my area up grading. Been thi king about a finned pan for mine along with being able to monitor temp. Not that it needs it, thats just what i do.
When i did lead frame i was impressed that the frictiins looked as good as they do. Though i dream of gpz frictions lol
Getting sidetracked with thus badass transmission
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