4r100 hard lines

Dieselboy. · May 2, 2015

Anyone ever made replacement lines from the trans to the cooler ?

My factory lines are a bit abused, I was contemplating going to a 1/2 line an pushloc fittings from the trans to the cooler. Any issue with a bigger line. Figure it shouldn't matter as it's just feeding the cooler (6.0 cooler)

Anyone know what fitting the trans is ?

Mark Kovalsky · May 2, 2015

There is no downside to larger lines. It will improve your cooling, but not by a lot.

ncollins64 · May 2, 2015

I ran push loc from my trans to 6.0 cooler in my fummins. I'll have to go back and find fitting size. No issues though

Dieselboy. · May 3, 2015

I was more worries that it might cause any issues. Just wanted to double check.

Marty shot me the fitting size. Believe it's 14x1.5 thread pitch to a -6 or -8.

dthompson · May 3, 2015

Yeah, my drag truck is 1/2 pushloc and works great!

jwlandry · May 3, 2015

I'm wanting to do the same thing.

My question is about the factory cooler in the radiator. Does it need to be there or can it be bypassed?

Ron's Power Stroke · May 3, 2015

my early 99 bypassed the radiator from the factory...

Mark Kovalsky · May 3, 2015

jwlandry said:
My question is about the factory cooler in the radiator. Does it need to be there or can it be bypassed?

Ron's Power Stroke said:
my early 99 bypassed the radiator from the factory...

Yes, it was, and that burned up a lot of transmissions. That's why Ford put it back in mid year 2000. So yes, you can bypass it, but you lose A LOT of cooling capacity.

Dieselboy. · May 3, 2015

With a 6.0 26 row and into the rad I rarely get the temp over 100* unless it's summertime or hauling heavy or racing in either truck.

I was thinking of bypassing it myself mark.

jwlandry · May 3, 2015

I'm planning a 6.0 cooler as well. I already have it ready to swap. I've just never started a thread to clear up my questions.

Right now I run a stock cooler and an alradco radiator, and a deep magtec pan and I've never seen over 155 on trans temp.