TH400 Oil cooler Pan

[v2500burb]

Cooler is here
Now come more questions:
1. Run in line with radiator?
2. Which line on the th400 is supply (hot fluid needing cooled)
Which is return?


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[GTME94]

I was also told, cooler first then through the factory cooler in the radiator then back to the trans.

It may seem counter intuitive to potentially heat it back up after the aftermarket cooler but you don't want the trans fluid too cold either.

 

[v2500burb]

Why not eliminate the radiator cooler?


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[austinado16]

How you do this is; Transmission continues to feed the HEAT EXCHANGER in the radiator tank, and then the fluid goes to the external cooler, and then the fluid returns to the transmission.

You do it this way, because the HEAT EXCHANGER in the radiator tank helps the ATF warm up fast, after initial start up. You want that, because "hot" oil performs AND protects at its designed efficiency.

The output line of the transmission goes to the bottom fitting on the HEAT EXCHANGER in the radiator. So you'll leave that fitting alone. You'll disconnect the top fitting on the heat exchanger, and connect the external cooler line to the exchanger's fitting, and then the return line from the cool will connect to that respective (upper) transmission line.

Generally, the external coolers can not be mounted with their fittings facing down, so mount the external cooler with the fittings facing to the side, or facing up. Facing the fittings down creates an air pocket......at least in the stacked plate coolers, which have a bypass row just inboard from the fittings.

 

[v2500burb]

Thank you


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[morrow07]

I ditched the factory by going to a Griffin manual trans radiator. I then went straight to the fin and tube cooler. Along with the deep finned aluminum pan, this tranny never runs hot.

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[v2500burb]

Anybody know where to get barbed fittings for trans and radiator?
Previous owner just cut the old lines


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[austinado16]

You should find them at the hardware store.....a real hardware store, probably not a lowz or home deep hole.

 

[v2500burb]

Do you know size?
I'm assuming it would be brass



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[austinado16]

I believe how the transmission line connects AND seals, is via "flare" fitting, so you'd be after that style. Maybe 1/4" flare?

So the radiator would get a fitting with the barb, and it would have male threads. The transmission line would get a fitting with a barb, and female flare.........if that makes sense. Both will be brass, or at least mine are.

Here's a photo that shows the fittings, if that'll help:

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[v2500burb]

So the fittings that come with that kit are what I would need for transmission and radiator??


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[austinado16]

I believe it's the 2 on the right that wind up being correct for our systems. The 2 on the left fit a different style/size connection.

Sorry I can't give better details. It's been quite a few years since I did my install, and because I purchased the kit in that photo, I didn't have to shop for fittings. I just used what came with the Super Cooler.