230 deg tranny temp. Pull over ??
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Elder User
Joined: Mar 2006
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230 deg tranny temp. Pull over ??
I was towing about 12k pounds yesterday and I ended up getting in some stop and go traffic and the tranny temps started climbing. It got to around 230 deg for maybe aound 10-15 minutes. If that happens again, should I pull over or is this okay as long as it's not for a sustained amount of time? By the way, what is the threshold on temp.
( I was in my 40 tow tune and the O/D was on )
( I was in my 40 tow tune and the O/D was on )
Hotshot
Joined: Feb 2007
Posts: 10,499
Likes: 10
From: Sterling Heights,Mi
I am no expert in this, but two suggestions, larger tranny pan, synthetic trans fluid. The pan helps keep things cooler, the syn doesnt seem to mind higher temps as much, and shortly, you will hear from the pro's....
Cargo Master
Joined: Jun 2003
Posts: 3,292
Likes: 6
From: Ardenvoir, Washington
I agree with Hedhntr above.. change the fluild.. I read somewhere where the oil starts breaking down around 220. I install a extra fan with a crowling around it (under $50 bucks) and mounting it right in front of the transcooler on mine.. I just switch it on when i am driving in stop and go traffic which makes your TC work that much harder and heats the oil..
Cargo Master
Joined: Jun 2003
Posts: 3,292
Likes: 6
From: Ardenvoir, Washington
If it smells burnt, i would change it out.. at least change the just the trans. Probably would only cost you about $20 in oil.. good insurance.. I see by yur signature you don't have an extra trans cooler.. that would also be good insurance to protect your trans and make it last longer.. it's the heat that kills them, so they say.
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Cargo Master
Joined: Jun 2003
Posts: 3,292
Likes: 6
From: Ardenvoir, Washington
Eric.. here is good article about transmission oil temps..
http://autos.yahoo.com/maintain/repa...ques123_0.html
http://autos.yahoo.com/maintain/repa...ques123_0.html
Logistics Pro
Joined: Jun 2005
Posts: 4,243
Likes: 16
From: AZ
If I was towing that kind of weight (which i do) I'd do, in this order:
)! BTW, if you pull over to let the tranny cool down, keep the engine running...the pump in the tranny must be turning to move fluid through the coolers.
- drain/flush/refill the system myself,
- install a large tranny cooler WITH a fan (if you will be doing stop & go hauling,
- install an external tranny filter and drain system,
- top the system off with tranny fluid
)! BTW, if you pull over to let the tranny cool down, keep the engine running...the pump in the tranny must be turning to move fluid through the coolers.
Postmaster
Joined: Jul 2006
Posts: 3,754
Likes: 1
From: Indianapolis
Although I never see over 120* on my drive to work (minimal stopping) however in the rat race home, and up a big hill, I can hit 180* if i push it hard (race the riceburners) I was wondering, whats a good synthetic oil to use, and how can I drain the TQ conveter? Any advice on aftermarket large drain pans w/drain plug?
Logistics Pro
Joined: Jun 2005
Posts: 4,243
Likes: 16
From: AZ
Here is a link to a do-it-yourself flush which will change the fluid in the TC too...1999faq/Maintenance-AutoT.htm
I use this method every year and my feeling is that any synthetic which meets MERCON standards is fine (I believe that it can now meet MERCON V standards, but I can't say that with certainty).
I use this method every year and my feeling is that any synthetic which meets MERCON standards is fine (I believe that it can now meet MERCON V standards, but I can't say that with certainty).
Postmaster
Joined: Nov 2004
Posts: 2,854
Likes: 0
From: New Hampshire
while pulling the 10k lb fifth wheel over a mountain i should have gone around last summer, the tranny temp crested 220 for a short period of time, i have a big tranny cooler added to my mule so the temp came right down as i idled down the other side... (the brakes took that beating...) anyway, i have mobile synthetic in the tranny and it only had 20k miles or so on it... i checked my mule over thoroughly after that little trek... the fluid has a slight, and i mean very slight smell to it like it was thinking about burning, but i don't think it did, syn fluid is supposed to be good to 250 degrees, although i know the seals in most trannys do not do well at that temp... so... since then, no fluid change, no difference in the smell of the fluid, and no difference in the performance of the tranny at all... i am, however, VERY happy i spent the extra money on the synthetic fluid AND the big tranny cooler, AND the tranny temp gauge...!!!