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Go Back   Dodge Cummins Diesel Forum > 07.5 - 09 6.7 Liter Cummins > 07.5 - 09 3rd Gen 6.7L Powertrain
07.5 - 09 3rd Gen 6.7L Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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Old 07-29-2009, 11:05 AM   #13 (permalink)
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in that type of heat you are probably going to need a AUX trans cooler with this truck as well. everyday driving unloaded with the TC locked I stay between 130 and 160 but. Hot days 90*+ in stop and go traffic unloaded I can get to 190 with the TC unlocked and have gotten as high as 230 offroading slow. If you can keep the TC locked the trans cools fast but in those situations where you're towing heavy and in stop n go or going slow up a steep grade your trans temps are going to get high quick.

I also have a PML deep trans pan and am taking the temp from the hot line.

You can try down shifting into a lower gear but its hard to keep the TC locked even with Tow/haul on if you are dropping speeds below 25mph consistantly. If you do get too hot pull over and thorw the trans in N and it will cool off a bit. A remote AUX trans cooler with fan is your best bet. I'll be getting one before next desert season.
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Old 07-29-2009, 01:49 PM   #14 (permalink)
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250* @ hotline- 90* out & towing 11k, stop and go for an hour.
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Old 07-29-2009, 03:59 PM   #15 (permalink)
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I recently returned from trip out to NW Montana and saw 145- 165 at outside temps up to 80 or so running 65 mph. I was towing 11m lbs. and use an Edge Insight for gauges. I saw 185 in stop and go traffic . In the Badlands it was near 95 and I briefly saw 207 on the winding road near the end of the loop.
Glad I put the PML pan on.
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Old 07-29-2009, 04:19 PM   #16 (permalink)
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I've been running in the 165-175 range these days. Our temps have been in the 1-teens.
I'm installing a Mag-Hytec pan This weekend. It will be interesting to see any temp drops with the extra capacity.
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Old 07-29-2009, 04:41 PM   #17 (permalink)
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I've been running in the 165-175 range these days. Our temps have been in the 1-teens.
I'm installing a Mag-Hytec pan This weekend. It will be interesting to see any temp drops with the extra capacity.
It will be nice to see what the new pan does for you. I've read some other posts some where a while back that even with the larger pan it got just as hot but just took a little longer to get there. I dont know how true this is and is why I havent bought one yet. For now I'm just draining and filling every 20k.
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Old 07-29-2009, 05:10 PM   #18 (permalink)
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I have the extra large PML pan. 4 quarts extra. No noticeable drop in tranny temps.
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Old 07-29-2009, 11:13 PM   #19 (permalink)
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I have the extra large PML pan. 4 quarts extra. No noticeable drop in tranny temps.
Sounds to me like adding an additional trans cooler w/ fan is the answer to our temp. issues. I wonder if adding a fan to the existing cooler would be as good?
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Old 08-01-2009, 12:30 PM   #20 (permalink)
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200+ the other day while shuffling between redlights in mid 80s weather. It went down once I got away from the traffic.
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Old 08-01-2009, 03:55 PM   #21 (permalink)
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None of the tranny temps posted are in a synthetic's danger zone, but if you want to increase cooling - as opposed to merely delaying overheating - an auxiliary tranny cooler is the best bet... the OEM unit mounted to the CAC "ain't that big".
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Old 08-02-2009, 02:31 AM   #22 (permalink)
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There is more to a tranny then the fluid, clutch linings and seals will not enjoy sustained 220*F+ operation
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Old 09-03-2009, 11:41 AM   #23 (permalink)
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There was a post where someone added an aftermarket transmission cooler in place of the OEM version but I cannot locate it.
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Old 09-03-2009, 05:53 PM   #24 (permalink)
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Quote:
Originally Posted by mileshuff View Post
I'd like to hear temps from someone who tows in 100+ degree with long steep 6%+ mountain grades. I live in AZ and thats a common summer issue.

Also wonder how water temp holds in extreme heat towing conditions.

My Hemi Durango starts to get hot and the auxillary cooler kicks in (its loud) and the water temp drops instantly. No issues towing in our extreme heat.
I pull my 9k TH around Utah all summer, one of my favorite spots is up a very steep 8% 20 mile twisty grade and as long as I can keep the speed up I dont have any problems at all...its the slow steep dirt roads that will give you trouble with your trans temps (4low cures it) but I have never had the truck coolant get above 210.
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