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Thread: tranny temp while towing ~7000 lbs

  1. #1
    2MCHPWR is offline Cadillac Owners Member
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    tranny temp while towing ~7000 lbs

    sup guys -
    my 2006 escalade has 90k miles. 4k miles ago, we replaced the tranny (coolant leaked into tranny cooler).
    We also used a bigger external cooler when putting in new tranny (Aamco).
    Truck has new E rated Falken tires, new bilstein rear air shocks and compressor, eletronic brake controller.
    Trailer is 20 ft enclosed v-nose. With gear and loaded up, its about 7000 lbs.

    Towed twice in last week, both times the travel time as 2 - 3 hours.
    See attached pic of the stock tranny temp gague.
    It was about 3/4 of the ways up. Typically, with no trailer, its 1/4 of the way up. With my old open trailer, it only got to be half way up. Now with this bigger enclosed trailer, it's going over the half-way mark.

    I'm concerned because it wasn't too hot (60-70) but in summer, it'll be in the 90's and I'll be about 1000 lbs heavier (family in truck and more gear in trailer).

    Thoughts?

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  3. #2
    wesyder's Avatar
    wesyder is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by 2MCHPWR
    sup guys -
    my 2006 escalade has 90k miles. 4k miles ago, we replaced the tranny (coolant leaked into tranny cooler).
    We also used a bigger external cooler when putting in new tranny (Aamco).
    Truck has new E rated Falken tires, new bilstein rear air shocks and compressor, eletronic brake controller.
    Trailer is 20 ft enclosed v-nose. With gear and loaded up, its about 7000 lbs.

    Towed twice in last week, both times the travel time as 2 - 3 hours.
    See attached pic of the stock tranny temp gague.
    It was about 3/4 of the ways up. Typically, with no trailer, its 1/4 of the way up. With my old open trailer, it only got to be half way up. Now with this bigger enclosed trailer, it's going over the half-way mark.

    I'm concerned because it wasn't too hot (60-70) but in summer, it'll be in the 90's and I'll be about 1000 lbs heavier (family in truck and more gear in trailer).

    Thoughts?
    Which transmission cooler did you add... Ive seen these temps also but i was pulling a 25 ft boat up a slight grade and it was at least 110 outside... So far ive put a lower temp thermostat, i will pull the enclosed car hauler in about 2 weeks

  4. #3
    2MCHPWR is offline Cadillac Owners Member
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    Re: tranny temp while towing ~7000 lbs

    I'll see if i can measure the cooler tonight.
    I was watching coolant temps and they were fine / normal so I don't think a lower temp t-stat would help my situation (or does my situation even need help?). Seems like others (search feature) said under 250 degrees is on the high side of normal. At 275, tranny temp light on dash blinks and lowers power output until temps cool down to 250.
    I'm just nervous about summer months and slightly heavier load.

  5. #4
    the cadillac man's Avatar
    the cadillac man is offline Cadillac Owners 10000+ Posts
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    Quote Originally Posted by 2MCHPWR
    I'll see if i can measure the cooler tonight.
    I was watching coolant temps and they were fine / normal so I don't think a lower temp t-stat would help my situation (or does my situation even need help?). Seems like others (search feature) said under 250 degrees is on the high side of normal. At 275, tranny temp light on dash blinks and lowers power output until temps cool down to 250.
    I'm just nervous about summer months and slightly heavier load.
    This may sound crazy but are you using the tow/haul mode of the tranny?
    I have towed before and it seems the tranny runs cooler in that mode(then again it does depend on the outside temp
    But I am using the stock cooler(at least I think its stock)

  6. #5
    2MCHPWR is offline Cadillac Owners Member
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    Re: tranny temp while towing ~7000 lbs

    yes I am

  7. #6
    the cadillac man's Avatar
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    Quote Originally Posted by 2MCHPWR
    yes I am
    That is risky temps I haven't seen mine get that high 250 is the highest I have ever seen mine get too while towing

    I wonder if using two coolers inline would help?

  8. #7
    2MCHPWR is offline Cadillac Owners Member
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    Re: tranny temp while towing ~7000 lbs

    how much weight did you tow? i'm looking for input from peeps doing 7k+ lbs. to make an apples to apples comparison.

  9. #8
    the cadillac man's Avatar
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    Quote Originally Posted by 2MCHPWR
    how much weight did you tow? i'm looking for input from peeps doing 7k+ lbs. to make an apples to apples comparison.
    The most I have ever towed was 3 tons and it was a camper trailer(I guess it was 3 tons it might have been more) and I did use the tow/haul the temp didn't get really high while I was towing
    It does help if you spray the radiator from the back to clear out any buildup from bugs and other gunk which will help the tranny cooler

  10. #9
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    Re: tranny temp while towing ~7000 lbs

    When I changed/flushed my transmission fluid the last time (10,000 miles ago) I replaced a quart of fluid with Lucas Trans Fix. I have used it in different vehicles for years with good results. I also used my Super Chips programmer to increase my line pressure for all three shifts to 18 PSI. My transmission at all times runs about 30* cooler than it did prior to taking these steps. I just pulled my 7500# boat down to Ft. Lauderdale this week running 70~75 MPH in 85* outside temps. I never saw my temp gauge reach beyond 230*.

  11. #10
    wesyder's Avatar
    wesyder is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by sprink60
    When I changed/flushed my transmission fluid the last time (10,000 miles ago) I replaced a quart of fluid with Lucas Trans Fix. I have used it in different vehicles for years with good results. I also used my Super Chips programmer to increase my line pressure for all three shifts to 18 PSI. My transmission at all times runs about 30* cooler than it did prior to taking these steps. I just pulled my 7500# boat down to Ft. Lauderdale this week running 70~75 MPH in 85* outside temps. I never saw my temp gauge reach beyond 230*.
    Nice

  12. #11
    2MCHPWR is offline Cadillac Owners Member
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    Re: tranny temp while towing ~7000 lbs

    Quote Originally Posted by sprink60 View Post
    When I changed/flushed my transmission fluid the last time (10,000 miles ago) I replaced a quart of fluid with Lucas Trans Fix. I have used it in different vehicles for years with good results. I also used my Super Chips programmer to increase my line pressure for all three shifts to 18 PSI. My transmission at all times runs about 30* cooler than it did prior to taking these steps. I just pulled my 7500# boat down to Ft. Lauderdale this week running 70~75 MPH in 85* outside temps. I never saw my temp gauge reach beyond 230*.
    very interesting. can you show me the exact model programmer you have? I see a few different ones on ebay. Thanks!

  13. #12
    sprink60's Avatar
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    Re: tranny temp while towing ~7000 lbs

    As far as I know it's the only one SC sells for 2005 Escalades and Yukon Denalis with the 6.0 LQ9 High Output Engine option.

  14. #13
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    Re: tranny temp while towing ~7000 lbs

    Heat is the big enemy of transmission oil. The cost of destroying one transmission will buy one hell of an oil cooler plus not having to listen to all the abuse from your old lady while you're waiting out in the desert for triple A.
    Don't mess with Binky Bear!


  15. #14
    the cadillac man's Avatar
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    Quote Originally Posted by dkozloski
    Heat is the big enemy of transmission oil. The cost of destroying one transmission will buy one hell of an oil cooler plus not having to listen to all the abuse from your old lady while you're waiting out in the desert for triple A.
    That's the truth plus a cooler is cheaper then the tranny(even a rebuilt one)

  16. #15
    sprink60's Avatar
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    Re: tranny temp while towing ~7000 lbs

    Keep it cool and clean and it will last. Abuse it with old fluid to the point of running hot ..... get ready to write that big check.

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