Diff temperature monitoring in stock instrument cluster
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2004-2007 Cadillac CTS-V Performance Mods Discussion, Diff temperature monitoring in stock instrument cluster in Cadillac CTS-V Series Forum - 2004 - 2007; I vaguely recall reading that someone (one of the other track day freaks, I think) was setting up their car ...
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    AAIIIC's Avatar
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    Diff temperature monitoring in stock instrument cluster

    I vaguely recall reading that someone (one of the other track day freaks, I think) was setting up their car to monitor the rear diff temp in addition to the tranny temp. Obviously one would need to use a switch to display one or the other in the dash cluster. Just wondering if anyone has successfully implemented this, and if so, were there any tricks to doing it?

    Just finished doing 3 track days in the last 5 days and the rear diff is not too happy - noticeably louder/whinier than before, and with some low speed howling type noise that I've never heard before. (With that said, I do have the lower seat cushion out, so I may be hearing noises that were always there and I just didn't know it.) Fluid is relatively new Amsoil. I'll be doing the fluid again here in a few days and I'm curious to see what condition the stuff that comes out will be in. I have a feeling a diff cooler is in my future if I'm going to continue to track this car.
    '05 Stealth Grey CTS-V, Hyper Silver Linea Corse Venetos w/Continental ExtremeContact DWs (summer), black Team Dynamics ProRace 1.2 wheels with 275/35-18 R-compounds (track), Hyperblack Rota Torques (winter), KW Variant3s, V2 front brakes, Hotchkis rear sway bar, EPS cam, TEA-ported 243 heads, FAST92 intake w/LS2 TB, JBA Camaro/G8 1-3/4" shorty headers w/JBA cat pipes, Corsa exhaust, UUC motor and tranny mounts, UUC shifter, MAPerformance trailing arms, Specter cradle bushings, etc...

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    ctsv154's Avatar
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    Re: Diff temperature monitoring in stock instrument cluster

    I think naf was working on this if I'm not mistaken.

  4. #3
    darkman's Avatar
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    Re: Diff temperature monitoring in stock instrument cluster

    Our transmission drain plug is the sensor. I wonder if the threads are the same as either of the differential access holes.

    (I thought Naf had a GMPP differential cooler setup.)

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    The Tony Show's Avatar
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    Re: Diff temperature monitoring in stock instrument cluster

    If the threads are the same, then it's a cakewalk. Order an extra sensor, install in diff and wire them together with a switch.

    It can't be that easy though. Can it?
    Rest in Peace, J.D. (aka Dirt_Cheap_Fleetwood)

  6. #5
    darkman's Avatar
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    Re: Diff temperature monitoring in stock instrument cluster

    Quote Originally Posted by The Tony Show View Post
    If the threads are the same, then it's a cakewalk. Order an extra sensor, install in diff and wire them together with a switch.

    It can't be that easy though. Can it?
    Maybe. Worst case would just involve some sort of thread adaptor.

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    AAIIIC's Avatar
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    Re: Diff temperature monitoring in stock instrument cluster

    Quote Originally Posted by darkman View Post
    Our transmission drain plug is the sensor. I wonder if the threads are the same as either of the differential access holes.
    That's one big question, one that I was hoping someone might have already figured out. That way I don't have to drain the tranmission just to find out myself.

    Quote Originally Posted by The Tony Show View Post
    Order an extra sensor, install in diff and wire them together with a switch.
    The other question I have is how the sending unit works, and how the switch would need to be wired. I would assume that the sending unit is just a positive and a ground, and thus I could just switch the positive/signal, but I'm not sure.
    '05 Stealth Grey CTS-V, Hyper Silver Linea Corse Venetos w/Continental ExtremeContact DWs (summer), black Team Dynamics ProRace 1.2 wheels with 275/35-18 R-compounds (track), Hyperblack Rota Torques (winter), KW Variant3s, V2 front brakes, Hotchkis rear sway bar, EPS cam, TEA-ported 243 heads, FAST92 intake w/LS2 TB, JBA Camaro/G8 1-3/4" shorty headers w/JBA cat pipes, Corsa exhaust, UUC motor and tranny mounts, UUC shifter, MAPerformance trailing arms, Specter cradle bushings, etc...

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    darkman's Avatar
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    Re: Diff temperature monitoring in stock instrument cluster

    Quote Originally Posted by AAIIIC View Post
    That's one big question, one that I was hoping someone might have already figured out. That way I don't have to drain the tranmission just to find out myself.


    The other question I have is how the sending unit works, and how the switch would need to be wired. I would assume that the sending unit is just a positive and a ground, and thus I could just switch the positive/signal, but I'm not sure.
    Call Luke or go to your local Cadillac parts guy and have them pull the two parts and look at them.

    I'll bet Heavy can tell you how to wire it.

  9. #8
    lollygagger8's Avatar
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    Re: Diff temperature monitoring in stock instrument cluster

    Did Luke or anyone else ever check this out? I'm interested

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