joe0508
charlotte
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Joined: 05/11/2010
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I am thinking about installing a transmission temp gauge to my fl80e trans.Manual says to install in the hot side of the fluid cooler line.The one that enters the bottom port of the radiator.I have heard that the fl80e has a test port above the shift linkage that it can also be installed.Will one location work just as well as the other.I understand that the cooler line is where the hottest fluid is.
joe money
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Mustang7370
Washington State
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Hey Joe,
If you crawl underneath your RV, look at where the lines come out of the transmission. Typically the line located farthest forward (closest to the torque converter) will be the hot fluid coming out. The line located to the rear is there to lubricate the gear train with cooled fluid. Generally speaking.
Chris and Kelli Withers
Ferndale, WA.
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Gale Hawkins
Murray, KY
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The PO had installed an external cooler and the sensor on the return line out of the second cooler. Works find but the read out ranges from 100-150F depending on air temps, running down the road or taking 15 minutes to back into a tight parking spot. 
Mounting it on the hot side will give you higher readings but either way it is a relative thing. I know if our return temp is 140F it is not 400F coming out of the TC. 
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joe0508
charlotte
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Where would be the best place to install.I dont really wont to install it in the pan.Why does the manual say to install in the cooler line entering the radiator.
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ScottG
Bothell Wa.
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joe0508 wrote:Where would be the best place to install.I dont really wont to install it in the pan.Why does the manual say to install in the cooler line entering the radiator.
Because that is where your fluid is at its very hottest.
Scott, Grace and Wesly
2003 Dodge 3500 4x4, 6 speed Cummins (lightly bombed),
2004 Forest River 25RKS many, many mods.
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mike4947
N. Syracuse, NY
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We've found using a test port to be about as good for actual tempature readings as in the output line.
Problem with pan mounted sensors is that it takes a heck of a lot of HIGH temp fluid to raise the pan temp.
We've had folks install double sensors in pan and output/test port locations and in all of them the pan rarely moved even when the output line showed 260+ degrees.
Another thing that bugs me to no end is the transmission cooler makers that say you should put the sensor AFTER the cooler. All that does is tell you if the cooler is working; not if you're cooking the trans fluid.
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joe0508
charlotte
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Hooking the sensor into the fluid cooler line.Will this give me an incorrect reading.Causing it to read to high rather than hooking it to a test port.
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John Wayne
Long Beach, Ca
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Different trans but on my trans temp reading is 5 degrees different from the test port and the scaqnguage IL that would be close enough for me. Go with the test port borrow a infer red temp gun and get a temp reading from the line to the rad. and see if they are close.
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JimGo
Glendale, AZ
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If you have an obdII connector just get a scan gauge My coach had no dash Trans temp gauge. Popped right up on the scan gauge.
Jim and Terri
2007 Pace Arrow 37C
W22 Chassis, 8.1 Vortec, Banks PowerPack, Allison 1000
2012 Chevy Nox LTZ AWD
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fourmat
NJ
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actually no matter where you put it what you are doing is monitoring normal whether in the test port or the cooling lines what you are looking for is a distinct rise in temp the rest is just the base line you start at.
2009 Challenger
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