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Old 07-22-2018, 07:59 PM   #1
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Normal operating temperature range for Allison 2100

Does anyone happen to know the normal operating temperature range for an Allison 2100 series transmission? I have a 2014 Thor Palazzo and we pull a 2015 Jeep Wrangler Unlimited. The last time that I pulled the Jeep the temp on the transmission was running between 194 and 200 degrees.

Thanks.
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Old 07-22-2018, 08:20 PM   #2
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Quote:
Originally Posted by Oldtrh View Post
Does anyone happen to know the normal operating temperature range for an Allison 2100 series transmission? I have a 2014 Thor Palazzo and we pull a 2015 Jeep Wrangler Unlimited. The last time that I pulled the Jeep the temp on the transmission was running between 194 and 200 degrees.

Thanks.
That isn't to bad.
The transmission is considered to be overheated when any of the following temperatures are exceeded:

Sump fluid 250 degrees F
Fluid to Cooler 300 degrees F
Retarder out fluid 330 degrees F
Bill
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Old 07-22-2018, 08:55 PM   #3
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Funny you should ask.... 180 to 190+ is fairly normal iirc.

Today it was 106 here in Texas and my Corvette trsns was running 196, oil 223 and coolent 203.
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Old 07-22-2018, 09:51 PM   #4
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I was an Allison Transmission Field Service Tech, I completely agree with the numbers posted by WILDBILL308 for what that's worth.
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Old 07-23-2018, 06:42 AM   #5
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Great. Thanks so much.
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Old 07-23-2018, 09:24 AM   #6
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OPERATING TEMPERATURES


To properly operate the transmission, adhere to the following minimum and maximum transmission operating temperatures:


Sump, minimum continuous 40C (100F)
Sump, maximum intermittent 121C (250F)
To cooler, maximum intermittent 149C (300F)


Source: Allison Operator's Manual
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Old 07-25-2018, 11:35 PM   #7
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I have trans temp gauges on both of my motorhomes. On our Itasca I can also see trans temp on the scangauge.

On the 6 Speed Adventurer in the southwest I see 150-160f on normal 80f day with little to no climbing and not towing. These numbers went up to 170-175 this summer when the ambient was +95 every day. This fall we will be pulling a toad so I'm sure the temp will go up 5 to 10f from those numbers.

On our Itasca back in Alaska (5 speed Allison) I rarely see more than 140f for trans temp when empty. When I pull my jeep or any other big load I will see 160f if I'm pushing it. Throw in some hills and the temp goes up some. Last week we hauled the RZR around and I never saw over 145f on the gauge. Mostly flat ground but hauling butt for sure.
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