Thread: Trans cooler question

Alright, as some of you may know, I just recently bought a Hayden cooler for my transmission. I totally bypassed the stock radiator cooler for safety reasons (don't want coolant ruining my trans should the radiator fail)

Well from the drives around town these past few days I was alright with the results. Took a little longer to heat up, and was always 10* cooler than my coolant (180-190). Today I finally drove it for about an hour and a half to 2 hours. For the most part, the above held true. Then I noticed that it started to creep to 210* while my coolant was dropping to 170*

Keep in mind, it was 110* out today, so not sure what it'll be temp wise in cooler weather, but needless to say I am a bit dissapointed. Here I was looking to improve cooling (normally 180 max with stock cooler) and here i've worsened it.

Now, to my question. Is there anyone else that bypassed the radiator cooler? and if so, did you run a puller or pusher fan, secondary cooler, etc? Don't bother telling me to add the stock cooler back into the loop cause I refuse. Personally had to swap out some friends bad trans' because of a radiator failure

Where did you mount the cooler?
On my GTO i bypassed the radiator and stuck the cooler in front of the radiator and saw my trans temps always being cooler.

Right in front of the radiator by the airdam

Waste of time IMO. See way more trans failures from Coolers then damage from the trans overheating.

i have a hayden cooler running by itself from 3EP... i scanned temps one day while scanning for KR on a 100+ degree day my highest temp was 193. keep in mind this was during several WOT runs... it actually got cooler at idle... seems like it would get hotter with no air flow.. then i thought there is alot less movement in trans to compensate for heat difference, it was only like a 5 degree difference. maybe get a bigger cooler?... what fluid u running.. im running dex6

Riddle me this, you have the hot side on the top or the bottom? I have it up top, cool side (return line) on bottom

Originally Posted by ninnyGTP

Riddle me this, you have the hot side on the top or the bottom? I have it up top, cool side (return line) on bottom

Hot should be on the top. hot fluid rises.

That's what I figured, that's how I placed it. I asked since the hot side on the stock cooler is on bottom

i dont remember how i have mine.. i figured it didnt matter.

and did you bypass the stock cooler or just run it through the return line

no stock cooler at all... all im running is a hayden cooler.

Just picked up an electric pusher fan that i'm gonna wire to a switch for when it gets up to operating temp i can fire it on to keep them there. Today it got up to 210 so i'm thinking the cooler is faulty

thats weird... i got down on mine several times under WOT into top of third and never got up to 200 degrees. are u using dex6?

get a b&m trans cooler rad


I run the desert fox kit. it uses a b&m rad, my temps never hit higher than 190 (even beating the piss out of the car on a hot summer day)

i got my gtp with a blown motor. but the trans had been rebuilt 31 miles before motor went. anyways while replacing the motor i noticed the trans shop had completely bypassed the stock and added an aftermarket cooler only... i was kinda concerned about it and went down to the trans shop to ask about it and also about thier rebuilds. he said they do that with every trans they rebuild and never had one come back with a problem because of it, and that was good enough for me... they are the biggest, best, and most expensive trans shop in town from what everyone says... and the 3200 dollar reciept i have prooves it. paid 750 for whole car btw(cant stop braging about the deal i got, lol) i dont like how they put the plastic ties through the rad though so i snagged a bigger better one off a truck from pullapart that bolts in that i still need to install. or heck, maybe even run them in series if i can attach the current one better.

Was just reading over the warranty info on my trans since I'm pretty sure it is now toast and thought this was pretty interesting...

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