Jim Lane

So I am replacing all of the TOC hoses on my Super Duty Transmission Oil Cooler, does anyone have any ideas where I might find the HOT line that goes from the transmission to the heat exchanger and has the access for the overdrive sensor.

I need one to install one of the temperature senders.

This is the line that I am looking for, it is the FRONT line and the one on the top,

A-518 transmission is shown and this is what I need, I have an A-727





There are no 1st Gen parts here in Southern California

Thanks
Jim

MARF75

None in southern Michigan either. Must be somewhere between us.
They are here, they are just junk here.

oliver foster

I will be pulling my 727 and replacing it with a 5 speed in my 12V Crew Cab this winter.
I will have lines left over from my swap then.
PM me if you like.

j_martin

Ya know, anything you get from a salvage will be 20 year old rubber.

I'd bet you could get one custom made, if you could come up with a sketch of what you need.

taterfarm

I replaced mine last year with one from rock auto for $24. It fit great, has the sensor port and the ends where formed fine. I read on here that someone had one from there and the ends didn't look very good but the one I received look just like the original with great crimps, no leaks or issues so far. great price too.


EDELMANN Part # B61129

taterfarm

oh and what are those diagrams from, is that factory or aftermarket directions? My D350 has the under bed cooler and has the same ridiculous looking splice with the the flow doing a 180 to go to the cooler. the cooler looks like the factory option I just couldn't believe how they plumbed it in.

Is this how all the factory installed coolers are plumbed?

MARF75

Yep

TIMMY22

Yea...Rock auto has the one w/ sensor port.

Also the "push lock" barbed hydraulic line works excellent. It's cheap and once it's pushed together (no crimping required), you are not getting it apart even if you hang from it. No clamps needed, will not rust, even the ends are brass and very flexible. It's rated to 300 psi and 300 degrees.

Jim Lane

The part is actually a 1/2" formed steel line from the output port on the transmission to the heat exchanger on the side of the engine.

Jim

Jim Lane

The part that you got from Rock Auto, was the line made out of steel or was it aluminum?

Jim

Jim Lane

This is part of the installation instructions for the Dealer installed Super Duty Transmission Oil Cooler

That ridiculous looking splice with the the flow doing a 180 is a thermal bypass and is installed to protect your transmission in cold weather and works on fluid viscosity, when the air temperature is above freezing (cannot tell you the exact temperatures) the warm oil will flow through the cooler in a normal manner but as the temps get lower the oil gets thicker and takes the path of less resistance, though the bypass and back to the transmission.

I believe it was added to the original package through a TSB.

Jim

Jim Lane

Are you sure about the temperature rating on the Push Lok hose

"push lock" barbed hydraulic line, which hose are you referring to?

Push-Lok Plus Multipurpose Hose - 801 257°F

Push-Lok Plus High Temperature Multipurpose Hose - 836 302°F

I think most people underestimate the heat generated by a transmission, today when I replaced all of the TOC hoses on my under bed cooler I found I have several harnesses that have melted along with the insulation on the wires inside that I need to repair where the loom was bundled along with the cooler hoses, it would be like a harness lying against the exhaust pipe, surprised the heck out of me.

Jim

bannerd

Steel dipped in a zinc coating.

taterfarm

I am not following you on the thermal bypass, thought the fluid went through the system regardless of temperature as it will be warmed at the coolant heat exchanger at the engine when its cold?

What are you using for a line from those compression fittings to the cooler?

I was going to replace my lines with hydraulic hoses with JIC fittings, I'm curious now what they actually called for from the factory? I dont think either of my autos have the correct type of lines on them.

And to confirm the rock auto line I have is steel as well.

dodgenstein

These coolers are not factory installed, rather they were a dealer installed part. Somewhere on DTR Jim Lane reprinted the Mopar installation instructions showing where the lines were cut, and hose routing. The steel line is cut pointing toward the trans, then the hose loops 180* toward the frame then to the cooler.