trans.temp gauge readings
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Freshman User
Joined: Aug 2006
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trans.temp gauge readings
Sure this has been discussed before, I recently installed Isspro auto. trans. temp gauge. All around driving with no load, I'm reading close to 160*. The info that came with gauge says it will read about 60-80* above ambeient temp. with no load. The ambeient temp. was 40* when I get the 160* reading! Come spring I'm towing my 8500 lb. 5th wheel to southwest. With that load , high temp. and mountains what temps. will I see and what temps. should I not exceed? I know that the fan is supposed to kick in to keep it cool. Would like to hear from others who have aftermarket gauges and what readings they see. Thanks!
Hotshot
Joined: Dec 2003
Posts: 15,368
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From: Stuttgart, Ar
I don't think that 60-80 ambient is very accurate. Mine runs 150-170F no load and 185 pulling a 5K camper trailer. I haven't noticed much difference between summer and winter temps--maybe a tad bit cooler. I don't think you have anything to worry about. The tranny cooler on these things is HUGE. Just keep it clean and you shouldn't have any problems
Junior User
Joined: Jun 2004
Posts: 84
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From: San Jose CA
The 5 speed auto transmission has a thermostat which adjusts fluid flow to the cooler, very much like the engine thermostat does for the engine coolant. I would expect that this changes the old rules of thumb we used to use on transmission temperatures that weren't thermostatically controlled.
Postmaster
Joined: Jun 2006
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Originally Posted by concordpete
thanks to all for the info. However, at what temp. do I pullover and let it cool or you are telling me that will never happen? Thanks again.
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New User
Joined: Nov 2006
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From: hayden,idaho
I believe that the computer will set a code for "overtemp" at 225 degrees. Overtemp codes are not good. They usually show up with problems in the trans like slippage.
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Post Fiend
Joined: Oct 2005
Posts: 10,626
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From: Plano TX and Brentwood TN
I actually would start worrying around 200, your still cooking your tranny oil pretty good at that temp. I have my digital gauge to do a tranny defuel at 190, the highest I have seen is 188 and that was before I had set my backdown as low as I did(I had it at 200). Your probably "ok" at 220, but I like to play it safe and try not to go beyond 200.
Elder User
Joined: May 2004
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mine hit 200 but not above. that was pulling my 14k lb trailer through the mountains in az during the summer. 95+ was the temps outside. i wasnt going to let it get above that but after the 13mi 6-8% + grade hill it dropped right back to 185 and didnt move again. but the rest was short hills for the most part.
EDIT: I forgot to add that it runs really close to the same temps unloaded. mine runs from 160-180 most of the time loaded and loaded. your fine with what your seeing. as everyone has mentioned.
EDIT: I forgot to add that it runs really close to the same temps unloaded. mine runs from 160-180 most of the time loaded and loaded. your fine with what your seeing. as everyone has mentioned.
Senior User
Joined: May 2006
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I've never exceeded 195 deg. The hardest I worked the truck was pulling my 16k 5th wheel up and down 3k of elevation changes going to Trinity Lake and the outside temp was between 100 and 115. The rise in engine temp (oil especially) was much more of a concern to me than the trans. If I were to do anything, I would want more engine cooling. The trans seems to hold it's own quite well.
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Originally Posted by badbrad60
I've never exceeded 195 deg. The hardest I worked the truck was pulling my 16k 5th wheel up and down 3k of elevation changes going to Trinity Lake and the outside temp was between 100 and 115. The rise in engine temp (oil especially) was much more of a concern to me than the trans. If I were to do anything, I would want more engine cooling. The trans seems to hold it's own quite well.