Thoughts on OVER cooling?
JK Junkie
Joined: Nov 2007
Posts: 2,192
Likes: 2
From: SoCal
B&M has some answer
B&M has some answer
h**p://www.bmracing.com/PRODUCTS/Automatic-Transmission-SuperCoolers
This is beneficial in cold climate areas to guard against lube system failure. Controlled by viscosity, fluid is returned directly to the lube circuit through bypass openings in the stacked plate core. As the temperature increases, more ATF is directed through the core. This highly efficient design combines improved protection against lube system failure with the required levels of optimal heat transfer.
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h**p://www.bmracing.com/PRODUCTS/Automatic-Transmission-SuperCoolers
This is beneficial in cold climate areas to guard against lube system failure. Controlled by viscosity, fluid is returned directly to the lube circuit through bypass openings in the stacked plate core. As the temperature increases, more ATF is directed through the core. This highly efficient design combines improved protection against lube system failure with the required levels of optimal heat transfer.
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JK Freak
Joined: Aug 2009
Posts: 500
Likes: 0
From: North Hills, CA
My jeep was always giving me the hot oil warning when I was wheeling. So I added the B&M plate style cooler. It seems to have cured the problem. I know you can over cool but out here in CA I don't think it will be an issue.
JK Junkie
Joined: Nov 2007
Posts: 2,192
Likes: 2
From: SoCal
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JK Freak
Joined: Aug 2009
Posts: 500
Likes: 0
From: North Hills, CA
Good point, I live in LA and mostly wheel in the desert. I'm not gonna see snow very often. Of coarse we got a little on the way to Moab this year so you never know I guess.
JK Junkie
Joined: Jun 2007
Posts: 2,467
Likes: 1
From: 4 Corners
I think you'd be talking Canadian or Alaskan cold to worry about the transmission temp being too low. I was averaging around 120 all winter with an Aeroforce (OBDII) reading. It shifted just fine. And it hadn't been above freezing here since before Thanksgiving.
A thermostat in the system would just be something else to go wrong. If it went bad, that could cause some major problems.
A thermostat in the system would just be something else to go wrong. If it went bad, that could cause some major problems.
Thread Starter
JK Enthusiast
Joined: Oct 2007
Posts: 277
Likes: 0
From: NC
Great link on the tranny life page. This is the type of stuff I was hoping to have discussed here. I do not think that I will ever over cool here in the southeast, but I was curious if others have hit this problem when cooling there tranny. I did not use the B&M cooler so my desigh is s bit different but it is working really well. I don't have a tranny temp gauge but the tranny cooler lines were very hot and you could not leave you hand on them longer than a second or two after driving for an hour or so in the hills. Now it is way cooler on the return line I am sure the transmission is thanking me everyday 
. JOE>
. JOE>
JK Junkie
Joined: Nov 2007
Posts: 2,192
Likes: 2
From: SoCal