Drill Mod to Slave? Ewill3rd?
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2004-2007 Cadillac CTS-V General Discussion Discussion, Drill Mod to Slave? Ewill3rd? in Cadillac CTS-V Series Forum - 2004 - 2007; ...
  1. #1
    lunarx's Avatar
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    Drill Mod to Slave? Ewill3rd?

    So a sticking clutch pedal is not unique to our cars.
    Apparently it plauges all M6 GM vehicles in the LSx family.

    I am having my clutch upgraded now and was looking on advice if I should perform the popular Drill-Mod to the clutch slave?

    Iíve changed my fluid but I still have a sticking clutch pedal.

    The next step if it already hasnít been done is the drill mod.

    What is the drill mod?

    To sum it up, basically GM didnít think things through all the way when selecting the hydraulic lines for your T56.
    The steel braided line that plugs into the master cylinder has a tiny, tiny hole in it, which causes unnecessary restriction.
    During a quick, high-rpm shift, fluid cannot get where it needs to go fast enough, so basically it will feel like you are shifting without a clutch.
    It may be difficult or impossible to shift into 2nd or 3rd, and you may have some problems with the pedal itself.

    When performing the drill mod, you remove the master cylinder, separate the line from the cylinder, and drill it out.
    To visit a site with full information and pictures, click HERE (see step 16) .
    It will be listed under the Transmission section, along with the adjustable master cylinder install (although you can do the drill mod without changing the master).

    Another good idea when doing the drill mod is to wrap your hydraulic line with some kind of heat reflective tape.
    Any thoughts?
    05 Mallett [M]/RPM CTS-V: 522WHP 487WTQ (DYNOmite) | 427 C5R Block | P&P LS7 Heads | Dry Sump Oil sys (12qt) | [M] Oi1 Cooler | Aeromotive 340 FP | LPE CAI | SW 1-3/4" Headars | RT Hi Flow Cats | B&B 3" Exhuast | ACT Twin Disk Clutch | UUC Shifter | RPM Trans Level-V Build | MN6 Geer Ratio Conv | Cryo Treated Diff | GM T2 Diff Cooler | [M] Anti Wheel Hop Kit | FG2 Shocks | SS Brake Limes | Slotted Cryo Rotars | [M] Modified Front Spindles | 275-35-19 PS2 F&R | [M] 19x9 Billet Whels F&R |

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  3. #2
    rand49er's Avatar
    rand49er is offline Cadillac Owners 10000+ Posts
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    Re: Drill Mod to Slave? Ewill3rd?

    Assuming there was a reason, why did GM put such a small hole in there?

    Is there a downside to doing the Drill-Mod? In other words, can drilling it bigger induce problems somehow?
    '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).

  4. #3
    ewill3rd is offline Cadillac Technician
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    Re: Drill Mod to Slave? Ewill3rd?

    I think I have heard of that.
    From a scientific point of view it might allow faster fluid flow.
    You'd have to really be working the clutch for it to be a major issue.
    The real issue with why the pedal won't come back up at times is more of a mechanical issue with the pressure plate than it is the hydraulic circuit.
    I can't really imagine what harm this would do as long as you keep it clean and remove all the drilling debris.

    Protecting the fluid from heat is a good idea, but with proper fluid not really critical.
    I can't tell you much more than that.
    I am sure some others will have some input.

  5. #4
    Cadillac Tony's Avatar
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    Re: Drill Mod to Slave? Ewill3rd?

    According to the Service Bulletin, the sticking clutch pedal issue is caused by centrifugal load on the clutch springs, not fluid flow.

    The post you quoted seems to be regarding the clutch not disengaging (the "shifting without a clutch" comment, in particular), not the pedal sticking.
    Tony Pagano
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    The views and opinions of this poster are solely his own and do not represent those of Plaza Cadillac

  6. #5
    lunarx's Avatar
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    Re: Drill Mod to Slave? Ewill3rd?

    Thanks guys, you are correct.

    The poster of the Drill Mod (who I quoted above) just added to his post and clarified that it has nothing to do with sticking pedal.
    Yes, sticking pedal is a PP problem that plauges large diameter PP's.
    He clarified that the Drill Mod is a mod that "helps high rpm shifting" and many people, who tried this mod, like it.

    My car does not have the sticking pedal problem.
    My clutch is simply too weak to hold my power.
    As I am now switching to to a Twin Disk, which has a much higher clamp load, I wonder if the drill mod will somehow benifit me.

    I guess I just need to try it and see.
    05 Mallett [M]/RPM CTS-V: 522WHP 487WTQ (DYNOmite) | 427 C5R Block | P&P LS7 Heads | Dry Sump Oil sys (12qt) | [M] Oi1 Cooler | Aeromotive 340 FP | LPE CAI | SW 1-3/4" Headars | RT Hi Flow Cats | B&B 3" Exhuast | ACT Twin Disk Clutch | UUC Shifter | RPM Trans Level-V Build | MN6 Geer Ratio Conv | Cryo Treated Diff | GM T2 Diff Cooler | [M] Anti Wheel Hop Kit | FG2 Shocks | SS Brake Limes | Slotted Cryo Rotars | [M] Modified Front Spindles | 275-35-19 PS2 F&R | [M] 19x9 Billet Whels F&R |

  7. #6
    JonCR96Z's Avatar
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    Re: Drill Mod to Slave? Ewill3rd?

    I've done the drill mod on a few f-bodys. They weren't having any problems, but we just did it as preventative maintenance. It didn't hurt 'em. Might as well do it.

  8. #7
    benelliwang's Avatar
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    Re: Drill Mod to Slave? Ewill3rd?

    LS1 guys has been doing the drill mod since 98 or 99. When I was swapping my 2nd clutch on my C5 I did it to my new slave. It's been 6 years without issues. Can't say the same about the spec clutch though.

  9. #8
    JIMMV is offline Cadillac Owners Member
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    Re: Drill Mod to Slave? Ewill3rd?

    Rumor was that GM did it to prevent two or three powershifts in a row. In a F-Body its hard to nail third without this mod done.

  10. #9
    lunarx's Avatar
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    Re: Drill Mod to Slave? Ewill3rd?

    Quote Originally Posted by JIMMV View Post
    Rumor was that GM did it to prevent two or three powershifts in a row. In a F-Body its hard to nail third without this mod done.
    I guess I need it then, because I also have trouble hitting 3rd when accelerating rapidly from a dig.
    05 Mallett [M]/RPM CTS-V: 522WHP 487WTQ (DYNOmite) | 427 C5R Block | P&P LS7 Heads | Dry Sump Oil sys (12qt) | [M] Oi1 Cooler | Aeromotive 340 FP | LPE CAI | SW 1-3/4" Headars | RT Hi Flow Cats | B&B 3" Exhuast | ACT Twin Disk Clutch | UUC Shifter | RPM Trans Level-V Build | MN6 Geer Ratio Conv | Cryo Treated Diff | GM T2 Diff Cooler | [M] Anti Wheel Hop Kit | FG2 Shocks | SS Brake Limes | Slotted Cryo Rotars | [M] Modified Front Spindles | 275-35-19 PS2 F&R | [M] 19x9 Billet Whels F&R |

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