Transmission suddenly running HOT! - Diesel Bombers



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Old 08-27-2017, 10:42 AM
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Join Date: Aug 2017
Location: Phoenix, az
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Default Transmission suddenly running HOT!

Hi all:
I'm new the forum and I've been having an issue with my transmission running hot. I've look through the previous post and saw a few very good suggestions but non have worked for me so far. Here's the issue:

I have a 2007 dodge 5.9 with the 48re transmission with a deep oil pan. I have a Edge CTS programmer and a few months ago the trans temp reading went up between 20 - 30 degrees (2008 -212 degrees - normal driving). My normal temp was around 185 - 188 degrees. These temps are with no load. Outside temp around 105. I generally pull a 13K fifth wheel trailer and I've only seen these temps when in heavy traffic, in town going extremely slow speeds. Here's what I've done so far:
1 - had the fan clutch replaced - mechanic said the fan was not keeping up to speed. Dodge OEM fan. It was pricey!
2 - disabled the trans cooling fan thermostat and flushed radiator - was a solution found on this forum (thanks) but did not solve the problem
3 - took the truck to a transmission shop thinking I might have a torque converter issue - no problem found with the trans.
4 - purchase an IR thermometer to confirm the trans. fluid temp. in the pan - temp was within 10 degrees (IR +- 2%) of what was displayed on the CTS No issues with engine coolant temp. Cooling temp stays between 197 -200 degrees max.

Not sure what I should focus on next so I'm looking for other suggestions and HELP! I'm getting desperate to solve this problem since I have a big trip planned for next month. Any help or suggestion will be appreciated.
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Old 08-28-2017, 11:30 AM
Diesel Fan
 
Join Date: Aug 2015
Posts: 49
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To me it sounds like your tranny cooler it plugged.
Not getting any air flow or proper oil flow.
replace it with a bigger aftermarket one
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Old 08-28-2017, 05:42 PM
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chopforeman...I appreciate the reply but I did flush the oil to air trans. radiator and it flowed well. Unless your referring to the oil to coolant radiator?

Do you know if dodge makes a larger trans. cooler radiator? It was suggested by a friend that I replace the stock radiator with a ford 7.3 type radiator. However it would required making some type of new brackets etc.

What's your thoughts on adding a powered aux. cooler in line with the stock cooler?

Thanks
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  #4  
Old 08-29-2017, 10:08 AM
Diesel Fan
 
Join Date: Aug 2015
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I am talking tranny cooler these trucks have a tranny cooler on them I bet the air flow is poor.
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Old 08-29-2017, 07:24 PM
Diesel Fan
 
Join Date: Jul 2013
Location: Alberta
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i think a aux tranny cooler would be a good idea.I am thinking of installing one this winter in my diesel.
because it goes from moter
rad
tranny cooler
intercooler
ac condensor
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Old 08-29-2017, 08:39 PM
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thanks chopforman...I'm looking into the possibility that I have a bad trans. sensor? I'm also getting a quote to get a powered aux cooler installed. I'll keep you and everyone who read this post know how I make out.
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