2008 Dodge Ram 1500 quad cab 4x4 hemi
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From: Lexington MO
2008 Dodge Ram 1500 quad cab 4x4 hemi
Hello everyone! Can't believe I just joined this group! I am the original owner of my truck, looking for answers to the transmission issues I have had when towing. The dealer mechanic says it is limp mode when the trans gets hot, it only has 2nd, third, and reverse. I believe I have the .390 gears and it came with the tow package. I want to know if there are any upgrades I can do without voiding the lifetime powertrain warranty. Thanks 😊
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Joined: Mar 2006
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From: Chesapeake, VA
I have heard that the tranny coolers for the 5.9L diesel is larger than the 5.7 cooler, and will fit in the existing mounts. I haven't seen it personally, maybe someone with experience will chime in.
When you say the "trans gets hot", do you mean overtemp with a caution light?
Are you operating in severe towing conditions? Hot weather, hilly conditions, heavy loads?
If the conditions are bad then a larger cooler may be the fix. If not then I'd rec troubleshooting your tranny. Start with reading tranny temps with a code reader, then dropping pan and doing visual inspection of fluid and trans body.
When you say the "trans gets hot", do you mean overtemp with a caution light?
Are you operating in severe towing conditions? Hot weather, hilly conditions, heavy loads?
If the conditions are bad then a larger cooler may be the fix. If not then I'd rec troubleshooting your tranny. Start with reading tranny temps with a code reader, then dropping pan and doing visual inspection of fluid and trans body.
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From: Lexington MO
The Transmission only does the limp mode thing when towing. After cooling down, it acts fine. Never any codes for dealers to read, or me. I will try the bigger cooler first since it will not void my warranty. If that doesn't work I will bring my scan tool with me next time I have to pull the camper.
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I have heard that the tranny coolers for the 5.9L diesel is larger than the 5.7 cooler, and will fit in the existing mounts. I haven't seen it personally, maybe someone with experience will chime in.
When you say the "trans gets hot", do you mean overtemp with a caution light?
Are you operating in severe towing conditions? Hot weather, hilly conditions, heavy loads?
If the conditions are bad then a larger cooler may be the fix. If not then I'd rec troubleshooting your tranny. Start with reading tranny temps with a code reader, then dropping pan and doing visual inspection of fluid and trans body.
When you say the "trans gets hot", do you mean overtemp with a caution light?
Are you operating in severe towing conditions? Hot weather, hilly conditions, heavy loads?
If the conditions are bad then a larger cooler may be the fix. If not then I'd rec troubleshooting your tranny. Start with reading tranny temps with a code reader, then dropping pan and doing visual inspection of fluid and trans body.
All Star
Joined: Mar 2006
Posts: 833
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From: Chesapeake, VA
Yep, that's the one Magnoom.
I recommend that you get a reader or dongle that displays trans temp. Pull over when you hit 220F or so.
I'd also suggest a pan drop tranny fluid change every year.
I assume you are using tow/haul mode to lock out overdrive.
I recommend that you get a reader or dongle that displays trans temp. Pull over when you hit 220F or so.
I'd also suggest a pan drop tranny fluid change every year.
I assume you are using tow/haul mode to lock out overdrive.
Last edited by jrsick; Jul 6, 2022 at 12:03 PM.
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Welcome to the forum
Last edited by gabbyRose; Jul 6, 2022 at 07:21 PM.
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From: Lexington MO
Thank you for all the assistance! I will be getting that trans cooler since the dealership mechanic say it will not void the warranty. I will monitor trans temperature next time I am towing to make sure it is good to go.
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