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Thread: Trans temp question

  1. #1
    TC-RT's Avatar
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    Default Trans temp question

    Just finished installing my MSaine trans a week ago. I have went through the break in period as prescribed with mild driving.

    After driving about 10 miles on the highway then 10 miles around town (stop and go traffic), my temp gage was reading 198 when I got home.

    20201212_155142.jpg

    I left the trans in neutral and immediately measured the temp at the pressure and return lines with an infrared thermometer at the radiator (I have Aeroquip -6AN PTFE Stainless braided hoses and fittings; no auxilliary trans cooler)

    Pressure line read 168.4
    Return line read 130.3

    My question; Is 198 considered to hot where I am measuring the temp in test port #1?

    My temp sender is located in the test port #1 below. I am using an adapter that threads into the test port so the temp sender does not protrude to far in the trans; see below.

    20201213_000310.jpg

    46re.jpg

    Fluid is serviced to the correct amount, cooler was flushed prior to install and lines are brand new.

    Just wondering why the temps between the actual line temps and at the trans vary so much and if the 198 temp is ok or not?

    Thanks for the help.
    Terry

  2. #2


    99dart's Avatar
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    From a quick google search this comes up. "The optimal temperature range for transmission fluid is 175 to 220 degrees. Above that, for every 20 degrees bad things happen, starting with formation of varnish at 240 degrees, followed by seals hardening, plates slipping, seals and clutches burn out, carbon is formed, and, ultimately, failure."
    An external auxiliary cooler is cheap insurance.
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    Quote Originally Posted by 99dart View Post
    From a quick google search this comes up. "The optimal temperature range for transmission fluid is 175 to 220 degrees. Above that, for every 20 degrees bad things happen, starting with formation of varnish at 240 degrees, followed by seals hardening, plates slipping, seals and clutches burn out, carbon is formed, and, ultimately, failure."
    An external auxiliary cooler is cheap insurance.
    https://www.amazon.com/Hayden-Automo...s%2C272&sr=8-4
    Thanks. I appreciate the info. Aux cooler is definitely cheap insurance.

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    I plan on running an aux trans cooler now.

    Pardon the crude drawing, but is this the correct flow when installing an aux cooler in series?

    Thanks in advance.

    20201213_233118.jpg

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    Quote Originally Posted by TC-RT View Post
    Just finished installing my MSaine trans a week ago. I have went through the break in period as prescribed with mild driving.

    After driving about 10 miles on the highway then 10 miles around town (stop and go traffic), my temp gage was reading 198 when I got home.

    20201212_155142.jpg

    I left the trans in neutral and immediately measured the temp at the pressure and return lines with an infrared thermometer at the radiator (I have Aeroquip -6AN PTFE Stainless braided hoses and fittings; no auxilliary trans cooler)

    Pressure line read 168.4
    Return line read 130.3

    My question; Is 198 considered to hot where I am measuring the temp in test port #1?

    My temp sender is located in the test port #1 below. I am using an adapter that threads into the test port so the temp sender does not protrude to far in the trans; see below.

    20201213_000310.jpg

    46re.jpg

    Fluid is serviced to the correct amount, cooler was flushed prior to install and lines are brand new.

    Just wondering why the temps between the actual line temps and at the trans vary so much and if the 198 temp is ok or not?

    Thanks for the help.
    Terry
    im not positive but from what I remember the test port doesnt always have fluid in it so it gets heat soaked and shows a falsely high reading. you will get a lower reading but closer to accurate by keeping the temp gauge sender in the pan instead. I keep mine there and usually show around 130-140 in the winter and 180-190 in the summer. also have an Msaine trans here. great piece of machinery compared to stock huh...


    All Bolt-ons, Heads, Cam, Gears, Stall, Hotchkis, Drag Radials
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