JOHNNYOLDS442

Trans lines to RAD or cooler?
Which keeps the temperature cooler stock radiator or small transmission cooler or can you hook up both?

oldcutlass

If your not racing or towing the radiator cooler works fine.

70cutty

Hook up both, run the line to the cooler first, then to the radiator, back to transmission.

72455

I have a medium size cooler attached to the front of the radiator on my '72 U code Supreme, and I just have the lines running to the cooler. Even in the brutal SE VA heat, I have no issues.

JOHNNYOLDS442

Yeah I like the idea of hooking up both.
It can’t hurt, besides every time I get behind my 442 I feel like a Race lol.

Fun71

My car has just the internal radiator cooler, and there haven't been any issues in the past.

If SE VA has brutal heat, I don't even know what to call what we have here in Phoenix. It's gonna cool down to the low 100s next week and that's a relief.

Vintage Chief

^^x2^^
Should work fine for nearly all stock applications. Although, I am a big fan of dedicated transmission & oil coolers.

JOHNNYOLDS442

I am thinking another chance of a leak too

JOHNNYOLDS442

Pic of cooler

JOHNNYOLDS442

So my car came with some twisted up lines maybe i should buy a new set of replacements i saw inline tube sells them.
Anyone have a diagram where they run ? do they run near the motor mount or around exhaust by the frame?
I forget.
I usually dont have to mess with them.
Thanks!

VC455

The reason you hook up both in the order that 70Cutty said is that it provides good cooling in the summer and preheats the transmission fluid in the winter for better shifting.

JOHNNYOLDS442

Cool, gotcha
but how do you know which way the fluid is traveling? It’s one big loop

cjsdad

I lived in the Phx area for 20 years and been to Virginia and North Carolina both in the peak of summer heat. I worked outdoors in all of the above conditions so I enjoyed the personal touch of Mother Nature in all of those locations. There is no comparison! The raw heat of Phx overshadows the "heat index" maximums of the East and then during monsoon when it is 118° and raining NOTHING compares to that! When the rain stops and the rain steams up off the earth, it is like being inside a steam oven. Just one of the reasons I no longer live there.

Thanks for the explanation of how the external cooler should be hooked up. I have been wondering the same thing myself.

joe_padavano

FYI, the factory RPO M55 aux trans cooler is connected after the internal radiator cooler, as shown in the CSM diagrams.

JOHNNYOLDS442

Thanks for the diagram joe!
it help me a lot!

Funkwagon455

I would suppose it would depend on where you live, and the climate you drive in. Over fifteen years ago I added 9C1 police car external oil and transmission coolers to my daily driven B body wagon here in north Texas. I called Greg Ducato at Pheonix Transmission and asked him the same question. He advised that in the warmer climate you could bypass the radiator cooler all together and only run the external cooler. Before the car got hard hit a couple of years ago, the 4L60 was still shifting fine with 273,000 miles on it. I still have it as a spare core in the garage... When I replaced the car, I transferred the same cooler setup onto my current B body wagon. Just my personal experience

69CSHC

Guys has any performance muscle era Olds come with additional coolers from birth ? I would think a 68/69 Hurst Olds is the most likely candidate, followed by 1967-1972 W30...



Makes perfect sense.

Funkwagon455

[QUOTE=69CSHC;1276891]Guys has any performance muscle era Olds come with additional coolers from birth ? I would think a 68/69 Hurst Olds is the most likely candidate, followed by 1967-1972 W30...

I definitely saw a '70 442 loaded with almost every imaginable option that had the factory aux cooler setup and tow package at our Zone Show. Beautiful Twilight Blue with blue interior. It had the original window sticker. It was later for sale on C/L, and then some time later was on EBay out of FL.

joe_padavano

Nope, never a mandatory option. It was always something you had to order separately.

ELY442

I bypassed the radiator and connected the hoses straight to the cooler with no problems. I even raced through the 1/4 mile with no problems.


I bypassed the radiator and connected the hoses straight to the cooler with no problems. I even raced through the 1/4 mile with no problems.

Sugar Bear

If adding a cooler wouldn't it be better to route the RPO way, internal radiator cooler first, then the auxiliary cooler and then the transmission?
If it goes to the auxiliary cooler first then the trans it would add heat from the radiator.

It looks like the RPO went to the radiator first.

70W-32

Right Stuff Detailing has the prebent trans cooler lines for about 45.00, and you wont have to send them back like when Inline Tube sends you the wrong part.

matt69olds

With a transmission that has a non-lockup converter, it probably doesn’t really matter which order the auxiliary cooler/radiator cooler goes.

Transmissions that have lockup converters have the radiator cooler after the auxiliary cooler. If you look at a hydraulic flow chard, the cooler is bypassed by the TCC valve in the pump. That’s so when your on the highway in -20 degree temps, the transmission doesn’t get too cold. With the converter locked, no converter slip, and no heat. Cold fluid doesn’t lubricate things nearly as well as fluid at operating temps. Having the fluid go thru the radiator cooler before going back into the trans ensures the fluid is close to engine temp.

Witha TH350 or 400 trans, if your working the trans really hard, probably having the cooler after the radiator is best. If your engine is always running warm, having the auxiliary cooler ahead of the radiator probably would make things easier on the engine temps.

69CSHC

Thanks Funkwagon, thanks Joe.