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Allison OEM Discuss repairing & maintaining an OEM Allison automatic transmission. is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 03-28-2004, 05:20 PM   #1 (permalink)
John R
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<DIV> </DIV>
<DIV>OK guys what does your trans temp gauge show for the temp on a normal drive on the highway?</DIV>
<DIV>Also how much hotter does it get when you tow heavy?</DIV></DIV>Edited by: John R


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Old 03-28-2004, 06:53 PM   #2 (permalink)
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Unloaded, on a 20 mile drive at highway speed, @ 50 deg ambient, the tranny will get to about 110-120 deg.

I just did another test pull of my trailer through various speeds, mostly highway for about 36 miles one way. The ambient temp was 62 deg. and the tranny temp leveled off at 150-155 deg. The trailer is 6000 lbs. and the AC was on. Engine temp stayed at 205-207 deg.

Got to love a diesel, I passed a pickup doing 55mph with the trailer. When I passed him I was doing 75 and still climbing. About 2/3's pedal travel.

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Old 03-28-2004, 07:18 PM   #3 (permalink)
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Before upgrade 200 to two ticks off 200 in the 90's and humid .... Deep pan and transynd ...

Once it gets HOT it stays hot for awhile .... Will the Mag Hytec shed heat better ?? We'll see ...

Going to be tough to evaluate do to tranny upgrades also.but I'll report as the temps rise in New England ...

I've cleaned out my Locker!
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Old 03-28-2004, 07:41 PM   #4 (permalink)
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Havent towed yet but 60 degrees outside 115-125 just running around. Takes a long time to run up any trans temp, I believe this is a non issue with an allison.
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Old 03-28-2004, 07:55 PM   #5 (permalink)
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This is direct from Allison's Website.

In normal duty, transmission sump temp runs in the 175-220F range (79-104C). Continuous operation above 220F can shorten the life of the transmission fluid. TranSynd is recommended for continuous operations at elevated temperatures.

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Old 03-30-2004, 08:08 PM   #6 (permalink)
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During summer weather running empty 135 - 150 degrees. Pulling 5ver 175 - 190 degrees is what I have logged. Running Mobil 1 ATF with stock pan. Also the faster you drive, the warmer the tranny will get! Just my observations! Edited by: Runaway
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Old 03-31-2004, 12:15 AM   #7 (permalink)
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So Cal to Nevada in 120*+ heat towing 3500lb boat, a/c on bone stock with afe filter and gauges, 210* trans after hill climbs and 190* down the flats, 70-75mph with brakes slightly dragging on trailer (was wondering why mileage went down). Normal so cal freeway driving 70-80 mph in 80* weather, 150-175*.
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Old 03-31-2004, 11:46 AM   #8 (permalink)
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I was having high temps when unloaded in stop n go traffic (220+). Replaced the OEM tranny cooler with a racing stacked plate oil cooler and it doesn't get above 180 now. I have seen very few people that have really high temps when towing. The high temps at idle was addressed by Allison with the upgrades that go along with the LLY. Some things I tried was adding a fan to the OEM tranny cooler, which had little to no effect. Changed to Transynd - little effect.

My father-in-law tows very heavy and never sees much over 200, but stop n go was killing me. That's why I increased the cooler size. The exterior is about twice as long and twice as thick and needed some line modifications and custom made brackets. Worth every penny as I no longer stare at the tranny temp gauge.
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Old 03-31-2004, 02:33 PM   #9 (permalink)
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this time of year in MI, I run 150*F for a 40-50*F outside. I ran that tempeven in the dead of winter after a 50 mile warm up with the winter cover on. I think that this is the optimum "cold" temp for the trans to run nicely. In the summer I have run her up to ~200*F in those 90* days. I haven't seen her climb much over 230* when summer towing.


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Old 03-31-2004, 03:00 PM   #10 (permalink)
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Transynd in mine, just returned from 1400 mile round trip to TN,, towing 12k 5er never went over 175ish. Only got that hot in the mts of Kentucky. Stayed right around 150 for most of trip, temps were no higher then 75

Eric Merchant

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