2009 F550 4R100 Transmission Temp - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 04-12-2011, 01:50 AM Thread Starter
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2009 F550 4R100 Transmission Temp

I just purchased a 2009 F550 and installed a Transmission Temp gauge in the PP, what are the average temps I should be reading? This is a 4R100 Tranny ?
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post #2 of 4 (permalink) Old 04-12-2011, 03:50 AM
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No. They haven't put a 4R100 behind a Power Stroke since 2003 (last of the 7.3's). 2003 6.0's up to 2010 6.4's have 5R110's, with the 6.0 5R having a little less than the 6.4 5R. The 2011 trucks have 6R140's.

Temps should average between 155-170 while daily driving, 170-185 while running the truck harder (light towing, hard runs through the gears unloaded). Heavy towing can get temps up in to the 210-230 degree range. Once you get in that 230 and higher range, the fluid is starting to cook itself.

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post #3 of 4 (permalink) Old 04-12-2011, 04:44 AM
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the trans temp should be taken at the cooler line coming out of the trans. That is were you will see how hot you torque converter is.

I don't know about the 5R110, but on the 4R100 the Pres. Port. is basically reading the case temp and the aluminum case acts like a heat sink for the engine.

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post #4 of 4 (permalink) Old 04-12-2011, 04:56 AM Thread Starter
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2009 F550 5R100 trans temps

Thanks for the info. My 2005 F350 was running about 140 so I was concerned about the higher temps I was seeing in my 550. Arer there any suggestions to lower the temp? Or should I not be concerned about it?
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