Installed a tranny cooler today! - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-04-2005, 12:31 PM   #21
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I actually have no temp sensor.... On the 95 and later the trannt temp can be viewed with a scantool... I know the 95'* have that feature... I think 94 may as well, 92-93 do not...

I was getting trannt temps as high as 230F, and that was with my 180F T-Stat... I didn't care for how hot the trans was getting... I added the cooler, and 180F for the trans seems to be the normal number after a lot of driving... I have seen anywhere from 160-190F while driving around town...

My 91, well I added it just due to the fact that I have seen my friend replace too many 4T60'*( THM440-T4'*) simply because they had become severely overheated and the tranny just quit... The fluid in all of these transmissions was almost black and has a nasty burnt smell... I have seen these come out of H and C bodies among others, but the 3800, 4.1(V and 4.5(V seemed to kill these trannies in a hurry, and the V8'* even had a cooler... Sso I added a monster cooler to the 91... The fluid no longer gets overheated( brownish color ) it stays pink... Trying to get every bit of life out of those trannies...lol

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Old 04-04-2005, 01:21 PM   #22
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Vital49 said "Where did you get your trans. temp. sensor and guage from? And, how did you install it?"

in regards to that question, i belive the trans temp sensor can be located on the top of that trans mission, in a presssure test port, it would be then located right below the engine air intake tube, go to willren'* websight and criuse that gallary, i belive he has a pic of the location.........

in regards to the fluid lines for the install of the cooler, i think i will bend my own, i did the same for my transmition a few years ago, but the ones that go directly into the transmission, (my old ones were almost chaffed to critticle levels due to some off roading..lol) it was not easy but i got it done and now they run higher up in the frame and do not hang down so low....as my old ones did....

as soon i get my cooler installed i will post plenty of pics....i have an idea for a unique install..........

this is a verry helpfull thread.....thanks guys!!

nicky
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Old 04-06-2005, 03:25 AM   #23
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GOT R DONE!!!!!!!!!!!!!!!!!!!!!! THE TRANNY COOLER IS IN............it makes a dramatic difrence in the shift feel, and the whole shking and shimmying at 50mph under load while in O/D i would highly recomend it to anyone who is inquiring about the trans cooler......i have 193000 on my 92 bonne with 120000 on the rebuild tansmission and that baby is shifting like the day she was bought!!!!!!!!!!!!!!!!!!!! no lie........so if your thinking of installing a trans cooler and reading this thread wondering if you shold. im here to tell you "get on that like white on rice, like spots on dice, like drugs on Miami Vice!!!!!!!" heres the pics folks

my install goes from the top of the radiator trans cooler to a fabricated line that takes the fluid to the aftermarket cooler, then ffrom that cooler back to the transmision, all solid lines, execept the ones inbetween the engine and the frame.....

and now for the pics.........
looking down on the trans cooler, notice the AN fittings used with the aircraft flare.....

the U bend that goes from the tranny cooler to the top of the factory tranny cooler

the U bend coming out of the factory cooler, and up front, it is the same line as you see in the previous picture

the bottem line going out of the tranny cooler to the transmision line

I cheated, i couldnt bend that line in one peice(didnt have the patiance) i may replace it with an AN flared union fitting.....im still contenplating that
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Old 04-06-2005, 08:59 AM   #24
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Wow! Very nice install. I like the copper lines. I was just going to use the rubber hose kit that came with mine...your picture are motivating me to do it with copper.
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Old 04-06-2005, 11:18 AM   #25
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the color got kinda off, those lines are steel 3/8" brake lines from auto zone, i just bought about 5 feet of it.........with that stuff you definatly need a tubing bender..........but copper might be a good idea.......definatly easier to work with.........thank you for the compliments.. any other ques or pic id be glad to awnser.........

ps were the line goes into the top of the factory cooler,,,, has a cone and a flare conection with a male thred in the end.......the line from auto zone already have these ends on them other wise a double flare mist be made and the fitting put on

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Old 04-06-2005, 11:32 AM   #26
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Great install.... I love it

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Old 04-06-2005, 05:59 PM   #27
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does anyone have cutout valves on their external cooler...........just incase the out in front cooler gets damged, the fluid can be diverted to just the factory cooler???????

second question......does anyone use a fan attched to their cooler........i bet this would help big time during sitting in trafic

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Old 04-06-2005, 08:50 PM   #28
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Default Easy install

I installed my Haydon 1403 18000 tranny cooler and it was easy. Mine is a little smaller than the one you used, but should be sufficient. My install looks a lot like yours too. I used a heavy spiral wrap instead of the tradional split loom. I wish I had a temp guage to show me the before and after.
Changed the fluid and filter after adding the new cooler. New springs and struts went in pretty well on monday. All I need now is the 7 way harness and brake controller and I'm ready to pull my camper.
Thanks for all the great help!!!
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