Where can I find 3/8" pre-made hard tranny cooler lines? I think that the stock lines are 5/16" so it doesn't make much sense to add a cooler with 3/8" then adapt it down to 5/16".

One other thing, the thermal by-pass. Where does one find one of these? Are they mounted in-line? Are they pre-set at a specific temp?

Any info is always appreciated.

Rog

 

Bypass
eBay Motors: TRU-COOL TRANSMISSION COOLER THERMAL BYPASS BY-PASS (item 170244184340 end time Oct-24-08 14:39:47 PDT)
As far as I know its set at certain temp (180 I think). I have not installed mine yet so I can't say for sure. It is mounted inline on both lines.

I think I have a link at home for lines so if you don't get an answer yet I will post it up.

 

what is the stock size? can i order a trans cooler with the stock size?

 

this place has cooler lines but they don't state if they are 5/16 or 3/8.
Inline Tube - Preformed Stainless & OEM Brake Line Sets

most stock lines 5/16. I think some have 3/8. Most coolers are 3/8.

 

Some of them come with adaptors to fit the OEM 5/16 line or optional 3/8.

 

Tim is right, the thermal break that comes with tranny cooler "Tru-Cool 4739 MAX" is set at 180F. I installed one and like it a lot.
The trans heats up very quickly even in the winter and just stays @ 160-180F under most conditions.
I've seen 200F once....20K load up a long hill, but went down after I let off the skinny pedal and slowed down a bit.

BTW: I didn't go with the larger tubes....might not be needed unless you really punish the trans hard.

 

That is my whole point, it doesn't seem right to restrict the flow of 3/8" cooler to 5/16" lines. I don't know how much of a restriction that is plus right now I am running a cooler that will accommodate 1/2" lines and I have that reduced to 5/16".

I did purchase a new stacked cooler like TJ has and while I'm going through the labor to install it I want bigger tranny lines as well.

I look into some of those supplied links and report back.

Thanks to all for your input.

Rog

 

They should be easy to fab up If you are handy with a tube bender and flare kit.
Especially if the OEM lines are not all bent up, they should make a good pattern.
You can rent the tools for free.

 

Do the 1999 to 2000 transmission hard lines fit good when replacing the 5/16" ?

Doing the cooler bypass and 6.0 cooler and like to have larger lines.


Been searching "transmission lines" and get trillion results, this is best thread I've seen yet.

 

I asked John Woods two different times what he thought of converting to the bigger lines and he didn't think it was necessary so I just dropped the idea.

 

These are the part numbers for the 3/8" SD 4R100 lines, keep in mind you'll have to either run the 4R100 bypass, make spacers for deleting the tube, or run something like the Dieselsite bypass delete. These will fit our E4OD's with no issues....

- F81Z-7A030-CA SD Cooler line
- F81Z-7A031-CE SD Cooler line
- 2C3Z-7H322-BA Bypass tube

-Jake