7.3 mpgs & 260 degree tranny fluid! - Dodge Cummins Diesel Forum
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post #1 of 46 (permalink) Old 04-29-2013, 12:34 AM Thread Starter
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Angry 7.3 mpgs & 260 degree tranny fluid!

This weekend we were pulling one of the mountain passes, and once we reached the top, we started up a windy gravel road and the tranny temp got up to 260 degrees! I thought anything above 230 was bad for your fluid?? Is my fluid burnt now? I had no choice but to keep going, as the road was very windy and not wide enough to pull over and stop.

We also only averaged 7.3 mpg's pulling a 35' toy hauler???? 6 something on the way up, and then it averaged out to 7.3 on the way back (down hill w/tail wind). This seems a bit rediculous! This is a new trailer for us, but i pulled heavier loads all the time with previous diesels and never saw this kind of fuel mileage!


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post #2 of 46 (permalink) Old 04-29-2013, 12:38 AM
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Auto, manual? What axle ratio? 2 wheel drive, 4 wheel?

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post #3 of 46 (permalink) Old 04-29-2013, 12:41 AM
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Check the fluid and see if it smells burnt.

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post #4 of 46 (permalink) Old 04-29-2013, 01:20 AM Thread Starter
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Quote:
Originally Posted by Slats Extend View Post
Auto, manual? What axle ratio? 2 wheel drive, 4 wheel?
Sorry, auto, 3.73, 4 wheel drive

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post #5 of 46 (permalink) Old 04-29-2013, 01:27 AM
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TowHaul on? I know last year I left a parking lot on the way up to a lake and forgot to re-engage TH mode and the tranny warmed up a bit. Nothing like yours but it was a slow winding road. No chance to get enough cool air and the converter wouldn't lock up. It was about 90 deg out too.

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post #6 of 46 (permalink) Old 04-29-2013, 01:32 AM
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Did you order the dual tranny coolers with your truck? I have them, and towing 10k over the pass I don't think my tranny even went above 200.

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post #7 of 46 (permalink) Old 04-29-2013, 02:05 AM
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Wow that's hot, I would smell the fluid. Also check and see of you have dual tranny coolers, and possibly think about upgrading them.

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post #8 of 46 (permalink) Old 04-29-2013, 08:42 AM
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Idk if you would have been able to do this safely, but I believe the recommendation if the temps get too high is to pull over, put it in neutral, an rev it a little for a few minutes

The trans is the one part I worry about most when I tow. I'm constantly looking at the temps on the evic. Is there an optimal range I should be looking for during towing or just a danger range? I think through hills of pa with my 5th wheel it never reached 150 and ambient temps were around 50-60*f
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post #9 of 46 (permalink) Old 04-29-2013, 09:31 AM
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If you never got above 150 your temp gauge is off.

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post #10 of 46 (permalink) Old 04-29-2013, 09:35 AM
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Staying below 150 in cooler temps is easy to do. With an accurate temp gauge. Without dual coolers.

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post #11 of 46 (permalink) Old 04-29-2013, 10:15 AM Thread Starter
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I bought my truck off the lot, and don't remember seeing dual coolers listed as an option so i am assuming no? Also, yes tranny was in t/h. I tried pulling over for a couple of minutes (in the one half way safe spot) and idling up the motor, but didn't seem to have any effects. Will be checking the fluid this morning to see if it smells burnt. I don't know what the evic said the tranny temp was, this was off my edge insight, and it started beeping around 220 or 230 (can't recall for sure now). I thought anything above 230 was bad for sure, any tranny experts? Thanks guys!

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post #12 of 46 (permalink) Old 04-29-2013, 01:36 PM
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Search for posts by TransEngineer. He's the expert and has covered overheating issues in other posts. On mountain roads the best thing you can do is grab the lowest gear to minimize the slipping but you cannot eliminate it if the TC isn't locked. I have a ranch buddy in Montana, he tells me he and other ranchers avoid autos because of all the mountain road towing they do. It eventually burns up the trannies. You may be wise to check into changing fluid and filters.

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