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1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-07-2006, 02:40 PM   #1
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I have read that certain parts of the country do well to have a tranny cooler. I live in SC and this will eventually be a daily driver. Whatcha think?
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Old 06-07-2006, 03:32 PM   #2
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Since it looks like you have some plans to increase your power and if you like to tromp on it at all, it is not a bad idea to add some cooling to the transmission. Others that have similar years to yours have found that the fluid stays red with an extra tranny cooler on. This gives you an idea of how much heat the cooler pulls from the trans.

Red fluid means good, brown means bad - too much heat.
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Old 06-07-2006, 04:08 PM   #3
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Agreed...

If you plan things that tax the trans..it'* a good idea.
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Old 06-07-2006, 04:21 PM   #4
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Default great!

thanks for the advice and you're right I do plan on "getting down on it". Where do I get it and how easy is this install?
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Old 06-07-2006, 05:11 PM   #5
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Install...most coolers are pretty straight forwad. Simply locate it..use supplied hardware to mount and plumb it in.

Where to get...I have a couple laying around that are from Caddy'* and also fit bonnies perfectly. They mount to the stock locations and cost me usually $15-20. Other ones can be found online or at your local autoparts stores.
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Old 06-07-2006, 06:03 PM   #6
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I agree on the cooler.... Heat is the enemy of any Transmission, but it was a real killer on all of the THM440-T4'*( 4T60'* )...

You should have the 2.79 Ratio trans being that you have an 88 SSE... If the trans is in good shape the cooler should help extend its life

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Old 06-08-2006, 10:54 AM   #7
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Ya know, I was really looking into doing this sometime this summer as well. I'd be interested to know what caddy models/years have compatable ones or what the differences in the ones for sale online are. I've seen 10k, 12k, an 15k GVW rated ones and am assumeing the bigger the # rating, the more the cooling (to a point). Also, do any of these require any sort of pump to circulate the fluid. Thanks again guys.
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Old 06-08-2006, 11:43 AM   #8
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Quote:
Originally Posted by qball
Ya know, I was really looking into doing this sometime this summer as well. I'd be interested to know what caddy models/years have compatable ones or what the differences in the ones for sale online are. I've seen 10k, 12k, an 15k GVW rated ones and am assumeing the bigger the # rating, the more the cooling (to a point). Also, do any of these require any sort of pump to circulate the fluid. Thanks again guys.
They require no pump to circulate the fluid...

If I read right you are in Ohio...

You may want to consider a thermostaticly controled unit so in the winter the trans doesn't get too cold...

Yes the larger the number the more cooling you have...

I have said this a million times.. As I live in FL I run coolers that are rated for RV + 5000-7000 Lbs towing... They have done their job keeping the fluid nice and red... I haven't changed the fluid on my 91 in about 2 years... I used to do it before the summer and the middle of the fall as the trans would overheat the fluid and it wouldn't last 1 year in this climate... By then it would be brown... So for 2 years in this heat the trans cooler has served me well... Its due for a change tho..

I also have a cooler like it but a tad larger on my 95 Bonneville... The fluid in it stays red.. In my hot climate I feel I did my self a favor by adding the coolers..

And if you plan to tow its a must

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Old 06-10-2006, 08:13 AM   #9
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Opinions: Plumb it in series with the existing radiator cooler or bypass the radiator and run just the standalone cooler?

I've heard it suggested both ways. Taking the in radiator circuit out keeps the engine'* heat from warming up the transmission fluid (which sounds like a bad idea)
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Old 06-10-2006, 11:27 AM   #10
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Default cooler

Go with the factory method of going to the radiator first, then out the top line to the cooler. This way your less likely to chill the trans fluid in the winter.
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