4r100 getting hot
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Joined: Feb 2016
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The last time my tranns went out it started getting hot then eventually blew the seals out.
i had it rebuilt & the first time i pulled a trailer it got hot on me. Changed the bypass hose on the side of the trans & it worked for a while.
i had it rebuilt & the first time i pulled a trailer it got hot on me. Changed the bypass hose on the side of the trans & it worked for a while.
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Joined: Dec 2012
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From: Las Cruces New Mexico
Early signs of a tc starting to slip, tc is always the first to go. Check to see if its not sliping. Also the by pass valve? Might be stuck clised and letting the tranny fluid reaching the transcooler
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Joined: Mar 2014
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From: Douglassville, PA
The tranny does get hot, I forget how hot but it is a specific number of degrees more than the outside temperature. You will need a trans temp gauge to start with. Or you could use an infra red temp reader and check it when it is hot.
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Fleet Mechanic
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From: Jacksonville, FL
Originally Posted by xp850
what temp range should a 4r100 usual be running at?
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Quick questions: Does this truck have a tuner on it?? Is this truck jacked up / lifted with huge tires & stock axle gear ratios??? These things can easily overheat a transmission STUPID fast!!
The next largest amount of heat generated in a transmission is from the shear fluid force that occurs inside of the torque converter. I would dis-connect both transmission cooler lines to inspect the cooling circuit for a blockage in the lines or in the radiator mounted cooler, or in the aux. cooler. , then run rubber hoses to a 5-gallon bucket & start the truck. Do you get good fluid flow from those lines? If so, re-connect the line that fluid was coming out of. Then re-inspect the return cooler line for proper flow. Doing this procedure, shows you what the cooler pressure line should be & what the pressure looks like as it comes back from both outside mounted coolers. Keep the fluid topped off during this testing. Keep in mind that doing this test will be cheaper than replacing the transmission, even just once! If there is not much flow, then there is a restriction in one of the coolers or the steel line itself. If the flow appears to be good, then replace the torque converter asap. I'd replace it, I'd replace that right away, first.
The next largest amount of heat generated in a transmission is from the shear fluid force that occurs inside of the torque converter. I would dis-connect both transmission cooler lines to inspect the cooling circuit for a blockage in the lines or in the radiator mounted cooler, or in the aux. cooler. , then run rubber hoses to a 5-gallon bucket & start the truck. Do you get good fluid flow from those lines? If so, re-connect the line that fluid was coming out of. Then re-inspect the return cooler line for proper flow. Doing this procedure, shows you what the cooler pressure line should be & what the pressure looks like as it comes back from both outside mounted coolers. Keep the fluid topped off during this testing. Keep in mind that doing this test will be cheaper than replacing the transmission, even just once! If there is not much flow, then there is a restriction in one of the coolers or the steel line itself. If the flow appears to be good, then replace the torque converter asap. I'd replace it, I'd replace that right away, first.
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