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  1. #1

    Default Ordered Some Goodies For The Burb

    Ordered some stuff last week to get my Suburban ready to start towing and this week parts started arriving. I am gonna put in a tranny temperature gauge along with a shift improver kit. Fairly cheap and easy to do, or so it seems. Got a free Summit hat in the deal too.



    '00 TJ
    '95 C2500 Burb

  2. #2

    Default

    Add an auxilary trans cooler too, the factory cooler is ok but you'll see a better reduction in fluid temperatures with something independant of the factory radiator and it'll help engine cooling by not having to share.
    You can never cool an automatic trans enough when towing.

  3. #3

    Default

    Quote Originally Posted by tbplus10 View Post
    Add an auxilary trans cooler too, the factory cooler is ok but you'll see a better reduction in fluid temperatures with something independant of the factory radiator and it'll help engine cooling by not having to share.
    You can never cool an automatic trans enough when towing.
    Thanks for the tip. I appreciate it.

  4. #4

    Default

    Got everything installed this weekend which leads me to a question. For those with the 4L80E, what is a typical summertime transmission temp assuming 65 - 70mph already warmed up? My gauge read a little less than 195* on the highway @ speed. For stop and go city driving I saw it climb up to about 210* and was wondering if that was normal. Thanks!

  5. #5

    Default

    Quote Originally Posted by battallion14 View Post
    Got everything installed this weekend which leads me to a question. For those with the 4L80E, what is a typical summertime transmission temp assuming 65 - 70mph already warmed up? My gauge read a little less than 195* on the highway @ speed. For stop and go city driving I saw it climb up to about 210* and was wondering if that was normal. Thanks!
    Hmm, that seems a little on the hot side if you ask me. I've always heard that it should be about 50 degrees higher than the outside temp, and maybe 60 or 70 degrees higher if towing. Unless you're towing in Death Valley, that's a bit on the high side. Anyone else hear that rule of thumb?

    Steve
    10 Chevy Traverse LT AWD
    02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

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  6. #6

    Default

    Yes I have also heard of that rule of thumb. I also think that 210 is alittle high. What degree thermostat is in it ?

  7. #7

    Default

    I think that sounds about right. Shoot, the engine temps don't run that low. Typically both my trucks run right in the 200-210F range for just the engine coolant. The transmission coolant gets MUCH hotter from the friction and such. I still need to put a trans temp gauge on my transmission...and a pressure gauge while I'm at it.
    Christopher

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half



    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

  8. #8

    Default

    Quote Originally Posted by cooldad31 View Post
    Yes I have also heard of that rule of thumb. I also think that 210 is alittle high. What degree thermostat is in it ?
    I don't know to be honest. I bought it about a month ago and didn't get any maintenance records from the previous owner. The engine itself is running about 170* and doesn't seem to move much. I actually was worried that might be a bit low since my car and Jeep both run a lot hotter than that but from what I can tell that is normal with the 454.

    This week it was about 20* cooler outside thanks to the remnants of Fay and the transmission was running about 180* rather than 195* I was seeing when it was 90*+ outside. Stop and go city driving still yielded about 210* on the tranny temp guage.

  9. #9

    Default

    210 is about where it'll run in stop and go traffic, highway driving should drop it to around 195. Theres a lot of friction and slipping going on in an auto trans, this builds up a lot of heat. Towing in stop and go traffic can easily push temps up between 250 and 275.
    This is one reason its always better to separate the engine and trans coolers, trans temps will push the engine temps a little higher.

  10. #10

    Default

    Quote Originally Posted by tbplus10 View Post
    210 is about where it'll run in stop and go traffic, highway driving should drop it to around 195. Theres a lot of friction and slipping going on in an auto trans, this builds up a lot of heat. Towing in stop and go traffic can easily push temps up between 250 and 275.
    This is one reason its always better to separate the engine and trans coolers, trans temps will push the engine temps a little higher.
    Thanks for the info! We spent the weekend running around the Smokey Mountain National Park and saw it climb up to 230 on some of the steep switchbacks which really started to freak me out a bit. I am glad to know that isn't too hot.

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