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Old 01-09-2011, 10:56 AM   #11
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I printed your chart and have it laminated in the truck.
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Old 01-09-2011, 05:21 PM   #12
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Quote:
Originally Posted by herk7769 View Post
I printed your chart and have it laminated in the truck.
herk7769, I am glad that is what it is there for and hope it helps others keep an eye on things.
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Old 01-09-2011, 06:56 PM   #13
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OK, so what do these temps mean? It seems to me that a temporary spike to a temp is a lot different than a continuous run at the same temp. So, for example, when I hit 205 at the end of a big mountain climb, but otherwise run about 155, I would think there is not much reason to be concerned. If, on the other hand, someone ran 205 all day for a couple of days, that would be a whole other thing. That temporary spike is unlikely to shorten transmission life I would think.
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Old 01-09-2011, 08:10 PM   #14
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Bob I feel the same way. The idea is to monitor the trans temp and pull over when it gets too hot. What had been missing was the yard stick of "what is too hot".
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Old 01-09-2011, 08:43 PM   #15
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Thanks Lou. I asked my dealer service department what the max temp was when I bought the truck and they did not know. They "thought" 220 was max. I did not know until your post that the DIC gives an alarm at 250. That is good to know. On our trip to Big Bend last spring I had a long climb into a strong headwind. The trans temp got to 216 and worried the heck out of me. Knowledge is good, thanks again.
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Old 01-10-2011, 09:08 AM   #16
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According to Wade's chart, it lists the average temperature. I interpret that to mean if your tow vehicle runs 200 degrees all of the time, expect the transmission to last ~80,000 miles. Now that being said, I realize a huge spike in temperature could break down the transmission fluid some, and cause problems. I can't think that the low 200s for short periods of time would be too bad.
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Old 01-10-2011, 09:11 AM   #17
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Chap's point is well taken. I keep my Driver Information Center (DIC) on Trans Temp while towing just so I know what is going on there. Forewarned is forearmed.
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Old 03-31-2013, 08:59 AM   #18
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Just browsing and came across this thread. http://bmracing.com/?wpsc-product=hi...2-diameter-fan
I installed one of these in my Avalanche under the radiator in the pocket behind the bumper, it does not need any direct air flow as the fan does all the work, it came with a temp switch but I installed a switch to operate it manually. It is amazing how cool it keeps the transmission, on long climbs I switch it on and the temp stays around 63-67C (145-153F) if left on just towing I get temps around 43c (109F).
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Old 03-31-2013, 12:32 PM   #19
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Right after I got my 2006 Dodge 3500 Diesel I was doing some extreme backing maneuvers with my utility work trailer (8x16 and about 8K#s with every tool I own). My customer was in a rural location, up a hill, with no place to turn the rig around if I just pulled in, so I backed about 150 yards up her twisted driveway. As I was completing this problem the transmission overheat indicator came on. That was enough incentive for me to find a cure. I researched it to death, and purchased a kit from ProWeld Performance Parts which uses a B&M Hy-Tek cooler (info link: http://proweldperformanceparts.com/S...hreeYears.html ) The price has gone up since I got mine in 2007 but Iíve never seen the light again, and that includes towing our 5er to California and back in July. The fact is, Iíve only seen the fan come on one time, and it was during that trip (something about a long grade, stuck behind an 18 wheeler, and over 100 degrees OAT). IMHO the extra oil, and cooler, not in the engine compartment has added a lot of cooling power to the transmission anti-destruction system for daily use, but most importantly for those cases where itís nice to not have to stop and let things cool down.
I've include a pic of my installation, looking forward from under the rear seat area.
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Old 03-31-2013, 01:17 PM   #20
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Doesn't the Allison/gm go into limp mode and de-fuel when trans overheat occurs?
The 08 duramax for sure has the cooler mounted underneath the truck and just ahead of fuel tank..
I wonder how optimal that is ?
I've been looking for a small shrouded fan to mount on it but its a pretty small cooler@ 8-1/2 by 10-1/2.

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