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Discussion Starter · #1 ·
My dad has a '93 Z71 that we are looking into putting on an aftermarket transmission cooler on because it sees quite a bit of towing duty. How much trouble is doing this, and how exactly do you do it? Is it as easy as disconnecting the lines that go into the radiator now, and putting them on the new cooler?

Any info is appreciated.

Thanks.
 

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They are a piece of cake to install. I would go with Perma Cool trans cooler for a class "A" motorhome if you have the room. You should be able to measure the room you have behind the grill and decide the size you need. Get the biggest cooler you can stuff under there.

There are two schools on installing the cooler. One is to just run the cooler isolated by hooking up the cooler lines directly to the cooler. The other way is to let the fluid go through the radiator first, then route the fluid from the lower cooler hose through the tranny cooler.

OK, OK... it makes sense to me... kinda.

Get the biggest cooler. It comes with instructions. Should take no more than an hour with hand tools to install (Taking front grill off take s the longest). Cost: about 60.00 out the door.
 

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That's not entirely correct, the routing is through the auxillary cooler *first* and *THEN* into the radiator... The reason for this is to ensure the temperature is fairly stable, plus have a slight cooling effect on the coolant (since it should cool below operating temp in a huge multipass tranny cooler)... This is especially true if you're in cooler climates during the winter...


My favorite style is stacked plate... It's the most efficient from a heat exchanger type point of view, etc...
 

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Discussion Starter · #5 ·
stacked plate... is that a type of cooler?

while we're talking about cooling temps here, ive got another question...

how much effect will putting an auxilary fan on the outside of the radiator have on the running temp of the truck during 5 o'clock traffic? the truck heats up at stop lights and cools off when we start driving again, so i'm thinking that an electric fan would help to cure this... the A/C also sucks while at a stop, so i think a fan would also help this... what do ya'll think?

thanks again
 

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"checker auto" sells a great "Plate" style cooler "complete kit" I think it was about $30 works very good. about an hour to install.
I would run to the radiator first then the cooler then the tranny. THAT is what the instructions tell you to do.
If you run to the cooler first and then the radiator it would completly defeat the purpose of the cooler
since you cooled the fluid down, and then warmed it back up in the rad, you might as well have never ran it through the cooler in the first place.
I dont think a stable temp is all that important since it is never consistant anyway. It starts out whatever the outside temp is and warms up from there anyway, an I SERIOSLY doubt you can over cool tranny fluid
 

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I was thinking about doing this as well. Corect me if I'm wrong, but there's a small tranny cooler already in the bottom of my radiator. Is that done away with or do I juat plumb the new cooler and run them both?
Gracias,

Mark
 

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Yes there is one there.
Thats what we are discussing wether it is better to still use it or not, or use both, and in what order.

I use both, so the fluid runs from the tranny to the Stock cooler in the rad (this cools it some), then to the external aftermarket cooler that you mount behind your grill & in front of your rad (this cools it much more), then the fluid runs back to the tranny. (nice and cool)
.
 
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