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Unread 06-21-2009, 11:01 AM   #1
conrasm
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2000 TJ Wrangler 
 
Join Date: Aug 2004
Location: Pittsburgh, PA
Posts: 3,808
WK aux tranny cooler

I'm planning on using my wife's 06 GC to pull out ~3500 lb boat once in a while, as in a couple times a year, longest trip being 120 miles one way. I've already installed the factory hitch and wiring, but was wondering if the tranny cooler that's already on it is enough. It has one loop of tube/fin across the front of the rad (which I'm assuming is for the tranny since it seems a little big for PS) and if needed I can tap into this and add another cooler.

Does the towing package come with bigger cooler? We'll have a long climb for the one trip, probably going from 900ft to 2000 ft above sea level on the turnpike and I don't want to fry her tranny.

She'll be following me in my truck pulling the 30 ft travel trailer, so I'll be keeping the speed to around 55-60.

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'00 TJ Sahara (RC 4" LA kit)
'06 Grand Cherokee Limited
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Unread 06-21-2009, 12:23 PM   #2
sanitarium16
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2007 WK 
 
Join Date: Apr 2008
Location: New York
Posts: 82
I have the towing package on my 07 JGC and it has a tranny cooler in front of the radiator. It also says it has an oil cooler and PS cooler. Probably the same things you have. It is sufficient enough. I would make sure your coolant is up to the task. When is the last time you changed it?
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Unread 06-21-2009, 01:14 PM   #3
conrasm
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I doubt it's ever been changed. Are you referring to radiator fluid or tranny fluid? Either way, they are original.

I'll have to climb under and trace the lines. I don't recall seeing an oil cooler, but if it's small I might have missed it when I was under changing the oil.

If anything, I was going to run another cooler in line with the factory one that's already there. I'd rather spend $40 rather than $$$$ for a tranny.
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Unread 06-21-2009, 05:32 PM   #4
colinzj
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2006 WK 
 
Join Date: Mar 2005
Location: Chandler, AZ
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You should be good on an 05 or 06, assuming the engine's rated for it. It's not until the 07s where Jeep decided to save some money (and adding an upgraded fan is required for the full 6500 on the 4.7s).

Nothing wrong with adding an auxiliary cooler if you want, though. Better to spend the money than burn things up.
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Unread 06-21-2009, 07:58 PM   #5
nostaw22
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1998 XJ Cherokee 
 
Join Date: Apr 2009
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Does your tranny have a dipstick?

If you look and find a plastic cap over your tranny "dipstick tube" then your tranny isn't serviceable... Which is to say the dealer has to change / measure / alter the fluid level (according to the factory). You can buy a dipstick from the chryler's suppliers online and you'll have to find a TSB on how to fill the fluid level and get some kind of reader to get the tranny temp from the computer.

Is a PITA...

If you have an aux cooler already I wouldn't worry about adding another one.
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Unread 06-21-2009, 10:24 PM   #6
sanitarium16
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I would change to coolant and transmission fluid if they are both origional.
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