Installed a tranny cooler today!
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From: Bloomington-Normal, IL 1997 SE
150-200 is about normal for our transmissions if my memory is serving me correctly. I installed one in mine last year and it helped out alot too. Definitly a "high mileage" mod.
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cooler installation
How hard are these to install? I ordered a Hayden 1403 cooler. Do I need an adapter kit to install this? Is there sufficient room to do the hosework and how much fluid does this add to the system?
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Hard runner I have some info for you... I'll have to dig up some pics... If I don't post, Please drop me a PM.. 
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Ok here we are...
This is a pic of the cooler on my 91 Bonneville... Just to give you an idea of how I set it up..
Here you see the cooler... Its a lot larger than it ever needed to be, and I don't even tow..lol.. On your 95 you will have plenty of room to mount the cooler... My 91 was very tight..
This pics shows the lines...
Here you will see the plastic coated U bend cooler line, I ordered this from GM Parts Direct, along with the cooler line for the tranny cooler, the line with the black wire loom..
The line from the trans ( in the black wire loom ) will go to the trans cooler, then back to the U bend line... This is how GM set up a lot of 4T60'* and 4T60-E'* from the factory... I have had no trouble or leaks with either car and the Aux coolers... Both of them as far as the lines go are set up just like they would have been from the factory... If you are towing a cooler may be a good idea... I have never seen a 4T60-E burn up, so they aren't as bad in any manner as the 4T60... But a little cooling may help the 4T60-E out a bit... I did mine due to the mileage concerns, and the amount of heat the trans would see idling around in traffic here in Florida... My overall running temps are also reduced, and it takes longer for the engine to break the 200F mark... I also run a 180-Tstat..
Good Luck
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This is a pic of the cooler on my 91 Bonneville... Just to give you an idea of how I set it up..
Here you see the cooler... Its a lot larger than it ever needed to be, and I don't even tow..lol.. On your 95 you will have plenty of room to mount the cooler... My 91 was very tight..
This pics shows the lines...
Here you will see the plastic coated U bend cooler line, I ordered this from GM Parts Direct, along with the cooler line for the tranny cooler, the line with the black wire loom..
The line from the trans ( in the black wire loom ) will go to the trans cooler, then back to the U bend line... This is how GM set up a lot of 4T60'* and 4T60-E'* from the factory... I have had no trouble or leaks with either car and the Aux coolers... Both of them as far as the lines go are set up just like they would have been from the factory... If you are towing a cooler may be a good idea... I have never seen a 4T60-E burn up, so they aren't as bad in any manner as the 4T60... But a little cooling may help the 4T60-E out a bit... I did mine due to the mileage concerns, and the amount of heat the trans would see idling around in traffic here in Florida... My overall running temps are also reduced, and it takes longer for the engine to break the 200F mark... I also run a 180-Tstat..
Good Luck
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pics r helpful
Thanks for the pics. I think mine is a little smaller and will fit easily on either side of the front of the radiator. Did you order a special kit with the needed lines and fittings or do you have specific part numbers. That looks like such a smooth install. I want mine to look as nice.
Thanks
93 Bonneville SE
Thanks
93 Bonneville SE
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From: Menomonee Falls, WI
nice install jr. i think my tanny cooler is just about that size, im going to use, my own made up lines to do so, did you put that protector plastic shileds to protect agaist chaffing of the metal tube, is the metal tube all the way from facotry line, to the aux. cooler? if so thats what i would like to accomplish, what type of fittings are the factory one that go into the factory radiator cooler? (flare, comprestion, o'ring) because im in search of those fittings....... thanks for your pictures and info.
nicky
nicky
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Re: pics r helpful
Originally Posted by Hardrunner
Thanks for the pics. I think mine is a little smaller and will fit easily on either side of the front of the radiator. Did you order a special kit with the needed lines and fittings or do you have specific part numbers. That looks like such a smooth install. I want mine to look as nice.
Thanks
93 Bonneville SE
Thanks
93 Bonneville SE
Disregaurd the bug matter in the last pic... It was a long trip...lol
Again you'll see the U-Bend pipe for the trans cooler GM PN#25615308
GM PART # 25615308
CATEGORY: All
PACK QTY: 1 CORE CHARGE: $0.00
GM LIST: $6.14
OUR PRICE: $3.51
DESCRIPTION: PIPE CLR
And the line covered with the wire loom, that runs from the radiator to the trans is, GM PN# 25623918
GM PART # 25623918
CATEGORY: All
PACK QTY: 1 CORE CHARGE: $0.00
GM LIST: $19.99
OUR PRICE: $11.40
DESCRIPTION: PIPE ASM-
You may be able to go to your local Advance/Discount or Autozone and get the correct lines, chances are that you have to tell them its supercharged to get the line for the trans cooler... The U-Bend may have to be a dealer item... Good Luck
Hope that helps..
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Originally Posted by neekolas
nice install jr. i think my tanny cooler is just about that size, im going to use, my own made up lines to do so, did you put that protector plastic shileds to protect agaist chaffing of the metal tube, is the metal tube all the way from facotry line, to the aux. cooler? if so thats what i would like to accomplish, what type of fittings are the factory one that go into the factory radiator cooler? (flare, comprestion, o'ring) because im in search of those fittings....... thanks for your pictures and info.
nicky
nicky
So far from what I can gather 1996 was the last year for a trans cooler on a bonneville... The bonnevilles used them from 92-96... I used the 92 Parts for my 91, worked like a charm...
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From: Purgatory
Very nice pics, Don. You make it look too easy! 
Where did you get your trans. temp. sensor and guage from? And, how did you install it?
I have a 28,000 GVW B & M transmission cooler sitting on the bench in my garage (talk about overkill! LOL). Just need to install it. But when I install it, I want to install a temp. sensor too.
Where did you get your trans. temp. sensor and guage from? And, how did you install it?
I have a 28,000 GVW B & M transmission cooler sitting on the bench in my garage (talk about overkill! LOL). Just need to install it. But when I install it, I want to install a temp. sensor too.