Transmission temperatures?
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2004-2007 Cadillac CTS-V General Discussion Discussion, Transmission temperatures? in Cadillac CTS-V Series Forum - 2004 - 2007; So I was driving on the Autobahn yesterday and was doing about 130 mph for about 30 miles continuously (the ...
  1. #1
    mstrjon32 is offline Cadillac Owners Enthusiast
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    Transmission temperatures?

    So I was driving on the Autobahn yesterday and was doing about 130 mph for about 30 miles continuously (the roads in Bavaria are awesome, BTW). I always like to watch my oil temperature and I'm comfortable seeing it run up into the 230*'s or more on long, high-speed drives...but I happened to thumb over to the transmission and noticed that it was running at 255*, which is near the "red line" on the gauge.

    Should I be worried about running it that hot? The heat must be coming from the exhaust...is it worth wrapping the exhaust in header tape near the transmission to try and force some of the heat away from it? I'm running Amsoil in the transmission, but still, I feel like 255* is quite hot...

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    rand49er's Avatar
    rand49er is offline Cadillac Owners 10000+ Posts
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    Re: Transmission temperatures?

    Funny you should post this. I've just been tooling around the area (suburban driving) and noticed how warm (not burning hot, but hotter than I'd think it should be) my shifter stalk seems to be. Only have a little under 20k miles on the Royal Purple in there. I didn't think to scroll over to the tranny fluid temp, but it's never run very high before.

    255 deg seems darn warm.
    '05 CTS-V, Maggie, Kooks, Hotchkis, Ground Control, Corsa, B&M, DSS/Hendrix, Full 3M Clear Bra, Autovation, V Headrests, CTS Console, STS-V 55w Fogs, Black Vette FRCs, Specter Werkes, Katech LS9 Clutch, SS Brake Lines, Heavymetals U-Turn Fuel Line Eliminator, Momo Combat Evo Shift Knob, Wldwhl Clear Sidemarkers, Linea Corse LC855 Wheels or OEM wheels w/'06-'07 Center Caps, plus a couple more. 472 RWHP/411 RWTQ (Mustang Dyno).

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    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: Transmission temperatures?

    The Service Manual says to change the transmission fluid as often as every 3,000 miles if the transmission is subjected to temperatures of 290 degrees Fahrenheit without an axillary cooler.

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    mberisha is offline Cadillac Owners Connoisseur
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    Re: Transmission temperatures?

    Mine's never got over 235F cruising the same speeds and and distances....

    BTW...were you in 5th or 6th.....and were "racing" them M3s?

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    mstrjon32 is offline Cadillac Owners Enthusiast
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    Re: Transmission temperatures?

    I was in 6th. The heat in the transmission must be coming from the exhaust...I wonder if yours is running cooler because you're running the Borla exhaust and it's routed farther away from the transmission...or just flows better and runs cooler?

    I was driving on my own when it got that hot, though I did have a a 330Ci drafting me into the wind doing about the same speed on the drive back, I moved over to the center lane, he stayed left and then started to fall back. I went to move back left and he flashed me to get back over in front of him so he could get back in the draft. It was pretty amusing, though if I had to brake he was going to come right up my ass.

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    Re: Transmission temperatures?

    Dayum, that's pretty warm!

    Cruising in TX for long periods at about 90ish with it over 100 deg I've never seen anything over 195 on the gauge.

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    zzilla is offline Cadillac Owners Fanatic
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    Re: Transmission temperatures?

    So saying all this has anyone installed a trans cooler?

    If so please share

    I have all the parts for it , cooler, pump, etc... just waiting for the car to get finished a the fabrication shop so I can install.

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    JimmyH is offline Cadillac Owners 10000+ Posts
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    Re: Transmission temperatures?

    That is funny. I have a dedicated trans temp gauge in the Camaro, and it never gets that high. However, with this heat lately, I have noticed some periodic warm spots on the console covering the transmission tunnel.

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    Re: Transmission temperatures?

    Quote Originally Posted by zzilla View Post
    So saying all this has anyone installed a trans cooler?

    If so please share

    I have all the parts for it , cooler, pump, etc... just waiting for the car to get finished a the fabrication shop so I can install.
    As you probably already know GM Performance sells one, Part Number 25534462. Luke at Lindsay can probably get them and they are available elsewhere. Current marker prices appear to be between 13-14 hundred dollars.

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    Re: Transmission temperatures?

    I picked up the GMPP Trans cooler from Luke at Lindsey Cadillac last year and have been running it with great success. The pump is activated by a contact switch installed on the outside of the case and comes on at 190F. The kit is plumbed through the trans fill and drain fittings and does not include a 1/2" pipe thread T fitting needed to retain the trans fluid temp sensor. Looking for an aluminum T because I don't want to hang any more weight off the side of the drain plug area than necessary.

    Depending on the track layout, the pump typically comes on about 15 minutes into a run and will continue to pump fluid through the cooler for about 25 minutes after you shut the car off. The pump is loud and you know when it is on. Can't remember what the draw is, FWIW it did not run my battery down.

    Will report back after next event with temperatures.

    Quote Originally Posted by zzilla View Post
    So saying all this has anyone installed a trans cooler?

    If so please share

    I have all the parts for it , cooler, pump, etc... just waiting for the car to get finished a the fabrication shop so I can install.

  12. #11
    odla's Avatar
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    Re: Transmission temperatures?

    Any pictures?

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    Re: Transmission temperatures?

    Yes...pics and temps plz

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    djgershom is offline Cadillac Owners Member
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    Re: Transmission temperatures?

    Funny, I was actually speeding from houston to san antonio with a few other people 100-120mph for about the same distance around 30 miles or so (didnt want to risk it) and noticed that all my oil temperatures dropped, not only that but my fuel economy went way up! I was shocked to say the least.

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    mstrjon32 is offline Cadillac Owners Enthusiast
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    Re: Transmission temperatures?

    I don't understand what is making the transmission so hot, though. I feel like it must be the exhaust heating it up externally...what inside of a gearbox would cause it to get that hot?

    The transmission cooler is interesting, but I feel like there must be something else I can do to get the temperatures down...

  16. #15
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    Re: Transmission temperatures?

    Quote Originally Posted by mstrjon32 View Post
    I don't understand what is making the transmission so hot, though. I feel like it must be the exhaust heating it up externally...what inside of a gearbox would cause it to get that hot?

    The transmission cooler is interesting, but I feel like there must be something else I can do to get the temperatures down...
    The heat in the transmission comes largely from the gear friction, for lack of a better term. Part of the 19% driveline-related parasitic loss in horsepower between the crank and the rear wheels in these cars involves the conversion of energy into heat both in the transmission and the differential. Additionally, the amount of parasitic loss is a variable rather than a constant and, therefore varies with the level of horsepower at play - thus faster driveline speeds translate into incremental heat.

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