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Old 09-21-2015, 06:13 PM   #1
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Transmission Temps

what is the average trans temp for the allison tranny in the 2006 alpine coach 40fd.

Thanks
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Old 09-22-2015, 09:25 PM   #2
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Mine can go as high as 205 going up hill, keeping RPMs up around 2000, when in 4th gear. High is over 220, my engine temp never goes over 199 going up hill, so mostly they are in step. Real high is 250. If normal yours is that high, take to Allison and have it checked out.

Sometimes, after long run (all day) and pulling into campground, while idling checking in, trans is giving up heat so it may hit 212-218, but will go down as fan cools coolant and the fluid circulates through radiator. Backing into spot will also raise it up some since you are not moving and the fan is just sucking in cooling air around small area. Like I mentioned 220 is ok, 250 is hot.
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Old 09-23-2015, 05:27 AM   #3
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Old Rv'er, my trans has been getting up to 225 according to the screen. But the gauge on the dash shows 185 to 190. Not sure which one is correct. I just had the trans serviced and the fluid changed and allison said everything was good. also my water temps will get to 212 and then the fan will speed up and and it will drop to 199-200 as the water temps climb the fan will speed up and the temps will drop. not sure if this the is way this is supposed to work or not.
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Old 09-23-2015, 09:23 PM   #4
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I don't know how or where the screen get it's updates from, EM will know. I always trust the Silverleaf screen since I have no way to compare it to the gauge since I normally just use that readout. Now that you have mentioned it, I will check both in the future, since there may be a variation although I don't think so. I can say, that after the new radiator, CAC and trans cooler were installed, it runs way cooler than it did.

I have my trans service scheduled for next Tuesday, and a coolant change with new radiator cap to boot. It's been about 13K miles since the last one and 3 years, so time I think is what is pushing this not mileage.
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Old 09-24-2015, 09:31 AM   #5
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Transmission temperature with the Allison 3000 series transmission will rise for two reasons:

High ambient temperature.

Low/ stop and go driving. Since the transmission torque converter is locked in "high 2nd" and all higher gears, torque converter slip is not an issue.

You don't have much control over ambient temperature, but you do in stop and go traffic. Shift to neutral is stopped. This will limit heat from torque converter slip.

Brett
Alpine 38FDDS
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Old 09-27-2015, 08:27 AM   #6
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Old Rv'er, guess i will take it in and have the radiator and trans cooler flushed. You mentioned cac. What is cac?
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Old 09-27-2015, 09:04 AM   #7
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CAC= Charge Air Cooler= Inter- Cooler= After-Cooler

It takes intake air (heated by the hot turbo and from being "compressed") and cools it down to near-ambient temperature before it goes to the engine intake manifold.

It is an air to air radiator.
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