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Can you overcool your transmission?


 
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Phi Eta Mu
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Joined: 04 Apr 2007
Location: Puerto Rico, USA

PostPosted: Sat May 12, 2007 5:53 pm    Post subject: Can you overcool your transmission? Reply with quote

I've got 1996 Cherokee classic 4WD with the upcountry pckg. (had a factory tranny cooler) which I used for towing and now will build for off roading. Recently I bought a 2001 XJ Sport 2WD which I will use as a daily driver and on the weekends for towing my boat which roughly weighs 2,500- 2,800 lbs with all my gear. I've read that the XJ can tow 2,500 lbs from the factory and up to 5,000, lbs with the towing package which among other things added an additional tranny cooler. I was given an Imperial / Hayden tranny cooler model maxicoolXL 243012 which is specked for towing up to 10,000 lbs. The manufacturer of this cooler has smaller coolers specked for the XJ. Is it possible that if this coller is installed I can overcool the transmission oil and cause problems?
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5.9 andy
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Joined: 15 Feb 2007

PostPosted: Sun May 13, 2007 8:49 am    Post subject: Reply with quote

i dont know much about towing or tranny's so wait for another person, but i would so no because the amount of heat created friction in a trannny is so high it would take liquid nitrogen to cool it so low to hurt it (ok mabe thats a little far but u get the point). if ur worried about ur oil not warming up and thinning u could just run thinner oil.

again, check with some one else.
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Sun May 13, 2007 10:05 am    Post subject: Reply with quote

The enemy of an automatic transmission is heat. The cooler it runs, the longer it will last. Can you cool it too much? No - and yes.

As far as hurting the trans by over cooling it, no. You can't over cool it.

But if you are in cold weather, the trans may not function properly until it reaches a certain temperature. So in that situation, if you had it set up to cool so well that it never reached the minimum temperature, then it may shift poorly, or not at all.

I think you will be fine , that cooler won't turn it into a ice cube or anything . I have never seen an auto wrecked from over cooling , from running in -30 with out being warmed up yes but from over cooling no . you might want to switch to a synthetic fluid because it should work better in the cooler conditions .
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Sun May 13, 2007 10:08 am    Post subject: Reply with quote

yep....

I noticed your in Puerto Rico so you don't have to worry about cold weather, that being said find the biggest trans cooler you can and stuff it in there.
_________________
96 Cherokee 7.5 inch TnT long arm Locked F/R, D44 rear, 4.56s, 35x12.50 Muds/36x12.50 TSLs
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Sun May 13, 2007 11:08 am    Post subject: Reply with quote

1fox2go wrote:
yep....

I noticed your in Puerto Rico so you don't have to worry about cold weather, that being said find the biggest trans cooler you can and stuff it in there.


for some reason i couldn't find were he lived , oh haha its because i looked while typing my message .
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Phi Eta Mu
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Joined: 04 Apr 2007
Location: Puerto Rico, USA

PostPosted: Sun May 13, 2007 4:26 pm    Post subject: Can you overcool your transmission? Reply with quote

Thanks for the info! I think I'll go ahead and mount that cooler some time this month. I'll be sure to follow up and post again in a couple of weeks and let you know how it goes.
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Mon May 14, 2007 7:49 am    Post subject: Reply with quote

I recommend you install a trans temp gauge, the aw4 runs a littler hotter than the Chrysler trans but still you should be around 170-180 normal running temp, with a cooler installed somewhere around 160-170

B&M makes a pretty good kit with a guage, I got mine from summit racing

www.summitracing.com

and a direct link to the guage

Click
_________________
96 Cherokee 7.5 inch TnT long arm Locked F/R, D44 rear, 4.56s, 35x12.50 Muds/36x12.50 TSLs
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Phi Eta Mu
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Joined: 04 Apr 2007
Location: Puerto Rico, USA

PostPosted: Mon May 14, 2007 8:52 pm    Post subject: Reply with quote

That's a nice kit, for what I see is a cheap price. Thank's for the link!
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