Tranny Temp
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Senior User
Joined: Oct 2004
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From: New York
Tranny Temp
Looking for some info...I just hooked up a Transmission temp gauge..What should the normal operating temperature be....not towing just around town driving...It read 155--160 degrees F...is this normal??? also what should the EGT gauge read on normal driving....
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Joined: Aug 2004
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From: Breezewood (S.Central) PA
My transmission camps out right about 180, plus or minus a few depending on uphill or downhill.
EGT are all over. But normal level cruse is about 750-850. I've seen it get as high as 1,200 when I was punching it up a hill and as low as 250 going down a long grade.
EGT are all over. But normal level cruse is about 750-850. I've seen it get as high as 1,200 when I was punching it up a hill and as low as 250 going down a long grade.
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Mine usually maxs out at about 100 degrees over outside temps, if I am running at Interstate speed running light or with a small trailer. It will show temps less than that when running light on rural roads.
Climbing mountains loaded heavy will cause it to sneak up a little beyond that, but I've never seen temps over 205 with the running I have done so far.
Temperature is related to loading, so higher weights, steeper grades, more shifting, and faster speeds all contribute to higher temps. The outside air temp will also affect the operating temp of the transmission due to the limits of heat transfer in the tranny oil coller.
Climbing mountains loaded heavy will cause it to sneak up a little beyond that, but I've never seen temps over 205 with the running I have done so far.
Temperature is related to loading, so higher weights, steeper grades, more shifting, and faster speeds all contribute to higher temps. The outside air temp will also affect the operating temp of the transmission due to the limits of heat transfer in the tranny oil coller.
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Joined: Jan 2003
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From: Southeast
Trans Temp
Got an 05 with BD X-monitor - mine stays at 145 empty. I've got the alarm set at 210.
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Postmaster
Joined: Sep 2004
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From: Utopia
I've heard majority of transmission damage happens over 200 degrees. I've seen 205 this summer when it was real hot. Pulled over to let it idle and cool down.
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My understanding of the problem is that the failures come from the breakdown of the tranny fluid which occurs quicker as the temps go higher. The fluid breakdown is cumulative, meaning that more time at higher temps results in faster breakdown, and when the temps come back down, the fluid is still "damaged". When sufficient fluid breakdown has taken place, the fluid will no longer do its intended function in the transmission which in turn leads to tranny failure.
Somewhere on these forums was a link to a graph that showed the correlation to tranny oil temps and its longevity, but I can't seem to find it right now...
My personal opinion that 200 - 210 is where you need to start thinking about reducing the load on the transmission, if you want you transmission fluid to last until the next scheduled change, but it is not a point at which you need to start sweating profusely worrying that your tranny is going to puke.
I will say this, if you see the OEM temp guage start to move above the middle of the "normal band", STOP IMMEDIATELY, cause you're on your way to fried tranny fluid. Stop and let it cool down so you can drive to the nearest dealer and get new transmission fluid...
Somewhere on these forums was a link to a graph that showed the correlation to tranny oil temps and its longevity, but I can't seem to find it right now...
My personal opinion that 200 - 210 is where you need to start thinking about reducing the load on the transmission, if you want you transmission fluid to last until the next scheduled change, but it is not a point at which you need to start sweating profusely worrying that your tranny is going to puke.
I will say this, if you see the OEM temp guage start to move above the middle of the "normal band", STOP IMMEDIATELY, cause you're on your way to fried tranny fluid. Stop and let it cool down so you can drive to the nearest dealer and get new transmission fluid...