Transmission temperature

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by TDCulbyy763, Feb 24, 2014.

  1. TDCulbyy763

    TDCulbyy763 New Member

    Hey everyone, I'm new to this whole thing and I just need some help on figuring out the normal trans temp on my 2008 silverado 1500. I've noticed lately that it'll warm up to about 200°F, is that normal? What happens if it gets even hotter? I bought it used about 8 months ago so I want to make sure my unicorn is always satisfied!
  2. poncho62

    poncho62 Member

    Right now (winter), it depends where you live. I take it you are in a warm climate. Here, it has been a cold winter, mine hasn't gotten above 125-150 all winter
  3. ajarman

    ajarman New Member

    My '08 with 33's, 3k stall and tru kool 40k sits about 80° above ambient. If you are seeing 200° without ragging on the truck something is wrong.
  4. TDCulbyy763

    TDCulbyy763 New Member

    Where should I take it to be looked at?
  5. Conlan Rose

    Conlan Rose Super Moderator

    The tranny may just need a fluid change to fix the issue. As the fluid ages it loses efficiency causing more friction and more heat. Just replacing the fluid and filter may be enough to fix the issue.
  6. TDCulbyy763

    TDCulbyy763 New Member

    Thank you so much for your help y all
  7. ajarman

    ajarman New Member

    Like said above the fluid and filter change might help, but deffently would not hurt. If you are running larger tires and you happen to have the factory 3.08 gear that might increase the temp as well.
  8. j cat

    j cat Active Member

    the temp should not be 200 deg f. 160-180 deg f is normal operating in a normal load condition at legal speeds.... My guess is the transmission is slipping. also the filter maybe plugged and this with old fluid will cause low pressures that cause the slipping and then the extra heat.

    what is the engine temp ? should be 190 deg f ..............
  9. TDCulbyy763

    TDCulbyy763 New Member

    Okay, I'm due for new fluids for my truck so I'm guessing that is what's happening. But the engine temp sits around 190 to 200 F .. The trans isn't slipping though so I'm guessing it needs new fluids.
  10. j cat

    j cat Active Member

    you cannot sense this slippage effect yet! If its slipping then you get the added higher temps.. As this continues it will then drop gears.

    this is a good tool [temp tranny ] to alert the operator that the transmission is in need of some work... hopefully you will just need some new dexronVI and a filter...

    engine temp should not be 200 or more deg f.

    I hope your where it is above 80 deg f air temp....because if it is 10 degf and you have 200 deg f tranny temp you could be in an expensive fix.
    Last edited: Feb 24, 2014
  11. RayVoy

    RayVoy Active Member

  12. silverado002

    silverado002 New Member

    Also, if you have a trans cooler then maybe check to see it is clean for air flow.
  13. CKNSLS

    CKNSLS New Member

    There is alot of misinformation posted on this thread. First, Rayvoy's chart is twenty years old. It does not take in to account today's synthetic transmission fluids that are designed to be able to run at much higher temperatures. The Dexron 6 transmission fluid can run up to 285 degrees. I have the source link-but it is a competitive forum to this one, so I don't know if I could post this. It was a question posed to Trailer Life magazine and answered by a GM engineer. If the the ambient temps are over or near 100 degrees, you will see temps over two hundred in your transmission. It seems to be an INTERNET THING that you transmission will blow apart at temps much above 200 degrees....simply NOT TRUE.
  14. TDCulbyy763

    TDCulbyy763 New Member

    Thank you very much for that. I'm going to go ahead and call chevrolet and talk to them
  15. poncho62

    poncho62 Member

    I think we can all agree that running a trans at 175 is better than 275.....:neutral:
  16. j cat

    j cat Active Member

    The temp of 200 deg f is too high with this vehicle. most as I mentioned operate at the 175 deg f , not 285 deg f. many have transmission failures with the continued operation at 200 deg f and above. the transmission has many parts ELECTRICAL that get heat damaged. the hotter the electric solenoids they tend to get damaged. evey one knows that the hotter a transmission operates above the designed temp the sooner the fluid is damaged , and a loss of transmission pressures. since he has this high temp with this vehicle ,,, HE HAS A PROBLEM.............

    you have you opinion I have my opinion.. good luck with the 285 F temps.
  17. CKNSLS

    CKNSLS New Member

    You will run at least 80 - 100 degrees above ambient temperature-hotter if you are towing. The manufacturer makes the transmission and the fluid to hold up under higher temps. It's not a matter of opinion...it's what is stated by GM.
  18. j cat

    j cat Active Member

    what was posted here on this is that his temps are not normal with this vehicle. 100 deg f + 80degf =180 deg f .. this is good.. when you get to 200 deg f all the time with this vehicle then you have something wrong....

    I just posted this because someone might think your idea of 280 deg f is a normal temp... that's all ..
  19. CKNSLS

    CKNSLS New Member

    You are correct partially. My intent is to inform those who don't use their trucks as tow vehicles apparently don't know that RVers see temps over 200 regularly when towing. The transmission is designed for this. It takes a little research to know this, since GM fails to mention in their manual what the NORMAL TOWING TEMPERATURE is supposed to be. And your transmission will not blow up, as I have towed my travel trailer (5,500 pounds) 8,000 miles in 8 months and did see temps climb above 200 when the conditions warranted it. I now have 40,000 miles on my 2011-Crew Cab. I never said 285 is normal-let me clarify,the fluid and transmission have been tested under severe conditions to 285. I believe at 275 your DIC will tell you to pull over and cool your transmission, so it would seem GM deems your transmission too hot at 275 degrees.
    Last edited: Feb 25, 2014
  20. j cat

    j cat Active Member


    the GM OEM tranny temp gauge only goes up to 260 deg f. . so If it is pegged then I would hope that even you would agree that this is very wrong..even if towing a properly sized/wt load with in the vehicles operating capacity...

    the member asking these question never stated any towing temp issues.. I will add that normal operating temps with many when the air temp is 40 deg f is below 160 deg F...

    on engine temps if your operating @ 230 deg F all the time the check engine/overheat light will not come on but you know that this is damaging your engine.. so the idiot lights are there to report to the idiots that something is about to blow up and to shut down the vehicle now ...

    the temp gauges with trained owners are used to inform them when things are getting out of the norm.. this is when a smart owner takes action to correct this type issues .

    so if towing where ever you live and the loads you tow and the terrain. if your above 200 deg f best get a bigger tranny cooler... they have some good sized coolers with a thermostat to bypass the tranny fluid when it is very cold out..that way you run with the fluid never getting too cold..many use these with towing very large sized camper types that do load down the vehicle with plowing thru the air at hywy speed.. my 20 ft 4,000LB boat cuts thru the air great and with a low double axle trailer sometimes you forget its behind you..

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