Trans Cooler Hard Line

[Knucklehead]

Well...Horse Hockey!!! Got the trans out, but in the process, one of the transmission cooler lines got damaged. Anyone know if those lines are available? Also, could a new piece be spliced in? If it can be spliced, is hardline recommended or can I use the rubber cooler line? How much pressure do those lines handle? The hard line got kinked about 3" from the fitting on the Trans. FYI, it was the one closest to the rear of the trans.

[Stuka]

You can add a section of hard line, thats easy. You will need a flanging tool and some fittings as well as a section of tubing which you can get at an auto parts store. I would try to avoid using rubber unless its temporary. The steel line will last far longer. The rubber can handle it, it just wont last. There is also more heat in that area from the exhaust and such. About to head off to work, but if you have any questions on adding steel line, post up. Its pretty easy to do.

[Knucklehead]

I am thinking all I should need is a union, a new piece of hard line and a flare tool. Never done it before, but it doesn't look like rocket science.

[Stuka]

Yeah its not difficult.

[lindel]

This would be a good time to add some reinforcement/padding to any points where the lines contact anything. 3/8ths fuel line makes good padding when you split one side and spread it open.

[ScottsMojo]

And since you've already spilled fluid all over, add a trans cooler before you button it up.


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[Knucklehead]

And since you've already spilled fluid all over, add a trans cooler before you button it up.


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You mean one separate from running the fluid through the radiator?

[Stuka]

And since you've already spilled fluid all over, add a trans cooler before you button it up.


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You mean one separate from running the fluid through the radiator?

Yup. An aux cooler can help a lot.

[Blazer3664]

Yup. An aux cooler can help a lot.

X2.

Helps keep the engine that much cooler too.
The blazer (mud truck) I used too wheel had overheating problems, not bad but had to watch how long you play between "cool down drives".
Aux trans cooler over doubled how long it could go between cool downs.
Didn't realize until then how much heat an auto trans dumps into the radiator.

Jim

[HeavyIron]

So it's best to put the aux trams cooler in line before the fluid reaches the radiator?
Also, are there any good junkyard candidates to get the cooler from?

[Stuka]

Yes before the radiator is best, keeps more of the heat away from the radiator.

[ScottsMojo]

Most of the mfgrs suggest you run the aux cooler in series with the original cooler with flow going through the radiator first, through the aux and back to the trans. But I would think their perspective takes into account a modern engine cooling package not a 30 year old AMC system. So if the objective is to keep heat out of the cooling system you can run it through the aux cooler first, or bypass the radiator all together.

Now that I've worked that out in my head I just recalled that when I replaced my radiator I didn't reinstall the aux cooler. Another task for the list...


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[Knucklehead]

Ok, got the hard line repaired. Still need to get an Aux cooler. That will be down the road a bit though. First objective is to get the beast back on the road.

[whsii]

FYI,

If your radiator is on the old side, it probably has settlement it. The settlement settles towards the bottom of the radiator, and insulates the transmission cooler built into the radiator, from the main radiator. This over time will make the transmission cooler less effective... Flushing will help some, just remember the cooling of the trany gets worse with age of equipment.

I know that this is not your problem now. Just a good reason to add the the external transmission cooler.

Just my thoughts.

[jaber]

Which line on the trans is in and which is out?
I'm asking for the TH400, but the TF727 would be nice to have in the same thread, for search reasons...

[ScottsMojo]

I don't remember, but when I put the aux cooler back in next week I will share my findings.

[ScottsMojo]

So I couldn't wait - according to TCI the upper line is the fluid return from the cooler. http://www.tciauto.com/tc/cooler-fittings

[Knucklehead]

Here is a diagram from the FactoryChryslerParts.com website for the stock 727 transmission lines along with the trans cooler.



Here is the URL for the Page in general. According to the link Scott provided, the front fitting on the 727 is the output to the cooler and the rear fitting is the return.

http://www.factorychryslerparts.com/sho ... bly=555437

[ScottsMojo]

If I am looking at that correctly it suggests the fluid passes through the rad cooler and then to the aux cooler?

[Stuka]

If I am looking at that correctly it suggests the fluid passes through the rad cooler and then to the aux cooler?

From the factory yes. But if you are wanting your engine to run cooler, put the aux cooler first.