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  #1  
Old 08-08-2015, 10:27 PM
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Transmission Cooler & Advice Needed

Hey all-

I've been having some issues with my 04 WJ (206K miles) for the past year. I started towing at 180K, had a tube/fin tranny cooler installed, and have had problems since. If the air temp is over 84 and I'm towing over 3 hours, I always get a Trans Over Temp light and have to pull over for a few hours to let everything cool down. Also, when the Jeep is hot and sitting in idle OR after backing my travel trailer in, it sputters horribly on a restart as if its going to die.

The tranny fluid was just changed before the last Trans Over Temp issue. They've inspected the tranny, head gasket and trans fluid for any signs of significant damage and can't find any. The mechanic suspected a head gasket failure on the way but the Jeep passed every test they tried.

I'm ready to sell my trailer because I can't afford a new vehicle right now. So disappointed. Would a bigger tranny cooler help? If so, what would you recommend? Also, I believe they bypassed the radiator.

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  #2  
Old 08-09-2015, 07:29 AM
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Re: Transmission Cooler & Advice Needed

Looks like that the transmission cooler capacity is not sufficient for your application. No idea on which cooler should be fine, but probably some other member will chime in.
And regarding the sputtering, this started recently and only during a hot start?
When im not wrong, there is a TSB regarding the formation of fuel vapor in the fuel line due to heat soak. Will see if i can find it.
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Old 08-09-2015, 07:40 AM
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Re: Transmission Cooler & Advice Needed

Ok, found it and hereby attached.
Attached Files
File Type: pdf tsb_wj_1803103.pdf (35.1 KB, 10 views)
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  #4  
Old 08-09-2015, 09:32 PM
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Re: Transmission Cooler & Advice Needed

Thanks!!! Any else have suggestions on a different tranny cooler, or anything else I can do to help with the temps?
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Old 08-09-2015, 10:14 PM
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Re: Transmission Cooler & Advice Needed

A larger trans pan will allow you to have more fluid in the system. An aluminum pan will transfer heat away better than a steel pan. I have on of these installed on my WJ

YourCovers.com Dodge Ram Transmission Pan, Deep, for 45rfe, 545rfe, 68rfe

Gauge install to go along with it.

Auxilary Gauge Mounting Locations

Some of my other mods might be of interest... sorry about the missing pics.
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Old 08-10-2015, 08:48 AM
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Re: Transmission Cooler & Advice Needed

Quote:
Originally Posted by Trav1s View Post
A larger trans pan will allow you to have more fluid in the system. An aluminum pan will transfer heat away better than a steel pan. I have on of these installed on my WJ

YourCovers.com Dodge Ram Transmission Pan, Deep, for 45rfe, 545rfe, 68rfe

Gauge install to go along with it.

Auxilary Gauge Mounting Locations

Some of my other mods might be of interest... sorry about the missing pics.
Each degree you can bring down the transmission fluid temperature will increase the life of the fluid and the clutches. Some googling learnt that a deep pan can lower the temperature by 5 to 10 F, so can be interresting. Also most of them have a drain plug, which makes next fluid changes a lot easier. But the price seems to be a bit steep, for arround $ 240 what i saw on the site here: Cast Aluminum Transmission Pans !, but there should be cheaper options i think. I red that when transmission fluid temperature goes over 200F, that the usefull life will be reduced by half and the higher the temperature, the shorter the usefull life will be.
A larger capacity cooler would be a cheaper solution though, since they go for about $ 45.
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  #7  
Old 08-10-2015, 10:07 AM
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Re: Transmission Cooler & Advice Needed

All valid points made by Frank when it comes to the pan. There are cheaper options and a trans cooler will make a significant difference for much less money. This throwing it out there for reference. The other plus was the ease of adding a trans temp gauge with the PML pan.

FWIW - Under normal stop and go driving during hot weather (with AC on) the trans temp has never crossed the 200 degree threshold. It got close one time while towing a 6x12 uHaul trailer filled with over a ton of car parts.
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Old 08-10-2015, 12:23 PM
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Re: Transmission Cooler & Advice Needed

Also important is the position where the cooler is placed. Best is in front of the AC condensor, so that it will be directly into the cool airflow.
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HID 8000K in low and fog / Quad Squad member
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  #9  
Old 08-16-2015, 06:52 PM
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Re: Transmission Cooler & Advice Needed

Thanks so much guys! What do you think of this:

http://www.summitracing.com/parts/bmm-70264

Having trouble finding a deep pan for a i6. Any resrouces?
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Old 11-26-2015, 08:11 AM
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Re: Transmission Cooler & Advice Needed

Fix issue?
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Old 12-20-2015, 12:04 PM
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Re: Transmission Cooler & Advice Needed

Quote:
Originally Posted by hoffmanestates View Post
Fix issue?
I actually ended up selling my trailer. Its just too much for this Jeep to tow. Sadly, I will be selling my Jeep this spring and moving up to a bigger vehicle and one that can tow without issue.
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