Does idling in park for long periods of time overheat the transmission? - Dodge Cummins Diesel Forum
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post #1 of 22 (permalink) Old 03-22-2009, 07:27 PM Thread Starter
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Does idling in park for long periods of time overheat the transmission?

I heard on here somewhere that our automatic transmissions don't circulate the fluid through the cooler when idling in park and it can cause the fluid to burn. It only circulates in neutral. Is this true? Will my tranny burn the fluid if idled in park too long? Will the truck still log idle time if I leave it in neutral?


2007.5 2500 White SLT quad cab 6.7 liter totally stock. Is the CEL supposed to stay on? 34,000 miles. 2nd stock turbo. white 3.73 rear differential ratio. J35 recall. 2 wheel drive. Plan on a DPF and EGR delete when I come up with the $$$$.
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post #2 of 22 (permalink) Old 03-22-2009, 07:56 PM
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I put my truck in neutral and firmly set the parking brake whenever I let it idle for any extended time.

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post #3 of 22 (permalink) Old 03-22-2009, 08:15 PM Thread Starter
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Do I really need to put it in neutral or is this just a bunch of BS.

2007.5 2500 White SLT quad cab 6.7 liter totally stock. Is the CEL supposed to stay on? 34,000 miles. 2nd stock turbo. white 3.73 rear differential ratio. J35 recall. 2 wheel drive. Plan on a DPF and EGR delete when I come up with the $$$$.
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post #4 of 22 (permalink) Old 03-22-2009, 08:18 PM
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I am on the fourth transmission now and the transmission shop told me that is part of the problem. Prolonged idleing in park. There are two replacement releif valves that will allow fluid to flow when in park.
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post #5 of 22 (permalink) Old 03-22-2009, 08:24 PM
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idling your truck isn't good for it anyway, on the 5.9 you can get cylinder wash, more than likely it applies to all ctd common rails. there are fast idle features available if not factory equipped.

i wouldnt worry about your tranny building heat because your idling in park. when towing heavy or working truck hard i idle to cool turbo with tranny in nuetral so it circulates and cools before shutting down.

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post #6 of 22 (permalink) Old 03-22-2009, 09:24 PM
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Yes it will overheat. I notice my tranny even gets hot in stop/go traffic(I hate driving it in the city). A gauge is a good idea, drop it in neutral and it will slowly kool off.

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post #7 of 22 (permalink) Old 03-23-2009, 07:53 AM
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The tranny doesn't circulate any oil at all in park. Any extended idleing should be done in nuetral. Or get your tranny worked over so it pumps all the time. Dodge has done this since day just about one and it's the worst thing for a tranny..............SRXtreme

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post #8 of 22 (permalink) Old 03-23-2009, 09:17 AM
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what about warming up (when starting) and cooling down (when shutting off)?

do you guys just idle in N for 3-5 mins? And is this O.K.? Cause thats what I've been doing since i got my license exactly 3 weeks ago .

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post #9 of 22 (permalink) Old 03-23-2009, 02:13 PM
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Quote:
Originally Posted by cumminspower2 View Post
what about warming up (when starting) and cooling down (when shutting off)?

do you guys just idle in N for 3-5 mins? And is this O.K.? Cause thats what I've been doing since i got my license exactly 3 weeks ago .
When warming it up for a few minutes leaving it in park is fine, same with cooling it off. After a good drive I'll let it idle down maybe a minute or so, or until my egts hit about 300dg, park is fine for this too as your not idling it down for an extended period of time(this would just be wasting fuel)

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post #10 of 22 (permalink) Old 03-23-2009, 02:18 PM
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I have never noticed this to be an issue at all. I do have an HTS Valvebody, maybe it makes a difference? I have a tranny gauge and my tranny never goes above 210 even when snowplowing...... On Amsoil fluids, I'm not worried about those temps at all.
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post #11 of 22 (permalink) Old 03-23-2009, 05:19 PM
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Quote:
Originally Posted by 2007 cummins 6.7 liter View Post
I heard on here somewhere that our automatic transmissions don't circulate the fluid through the cooler when idling in park and it can cause the fluid to burn. It only circulates in neutral. Is this true? Will my tranny burn the fluid if idled in park too long? Will the truck still log idle time if I leave it in neutral?
Yes, a stock trans does NOT circulate fluid in park. There is less than a pint of fluid in the pump gears and that is all the the lube and cooling the pump and TC hub has in park. Needless to say a long time idling is going to cuase issues there. So, no its a load of BS.

Yes, the truck will log idle time as long as the rpm's are under 1100.

Circulating in park can be achieved either wih a shift kit, or the swapping of one valve in the VB. Pretty cheap insurance either way you go.

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post #12 of 22 (permalink) Old 04-11-2009, 11:32 PM
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what is considered long ilding and if you and a shift kit or swap a valve body iam guessing no factory warranty i just bought my 1st diesel and its still under warranty

07 2500 5.9 4x4 QCSB,
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