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Thread: occassional grunching of gearbox

  1. #1
    joelrkaplan
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    occassional grunching of gearbox

    Noticed overweekend that on my 70T there may be occassional grunching when going into first or reverse. Car has @115k and tranny/box is original and apparently in nice working order, except for this. What should I be on the lookout for? Thanx......

  2. #2
    Moderator Chuck Miller's Avatar
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    Joel,

    The first thing I'd check is the clutch adjustment...

    Should be about 1" free-play from both top and bottom of peddal travel

    Cheers,
    Chuck Miller
    Creative Advisor/Message Board Moderator - Early 911S Registry #109
    R Gruppe #88

    TYP901 #62
    '73S cpe #1099 - Matched # 2.7/9.5 RS spec rebuild
    '67 Malibu 327 spt cpe - Period 350 Rebuild

    98 Chevy S-10 Utility
    15 GTI Commuter

  3. #3
    Chuck is on the money.
    You can also catch a piece of another gear if the shifter is not adjusted correctly. I've witnessed this on 4th to 3rd downshift.
    I don't imagine it's a synchro because you'd be moving to have that one pop up. I also owned a '70 S with a tired 3rd gear synchro. Had to take it slow (which is hard) on the 2nd to 3rd upshift.
    Check your clutch first; it's the easiest to fix and most likely candidate.

    Good luck,

    Tom
    "Be who you are and say what you feel because those who mind don't matter and those who matter don't mind." - Dr. Seuss
    "Experience is the mother of wisdom" - idiom
    "Let them that don't want none, have memories of not gettin' any"- Brother Dave Gardner

    Early S Registry #235
    rgruppe #111

  4. #4
    joelrkaplan
    Guest

    Thumbs up

    will do...thnx

  5. #5
    FWIW: A friend and I did a complete clutch assembly replacement on my car today. The engine didn't get back in before time to go home but will be in first thing in the morning. I'm doing it at a friends service station.
    New clutch, pressure plate, flywheel, clutch fork, pilot bearing, and new rear main seal. A buddy is helping (or actually doing most of the work!) and has the Porsche tool that makes installing a new rear main seal a breeze.
    We also checked the pump timing and found it to be out about 3-5 degrees. Enough to cause "issues". I suspect that when the new timing chains, gears and Carrera Tensioners were installed that the pump wasn't exactly right on the money to begin with as I know it had a new belt installed. The timing chains swap only exacerbated the problem. It's on the "mark" now.

    The last thing I have to do once the engine is back in the car is to install my WEVO coupling. What a nice piece of work this little item turned out to be. I'm pretty excited about the prospects and will pass along my findings. I've already acquired an .06 shifter assembly from a friend and will use it for my donor unit for the full WEVO shifter build up. I'm planning on a classic look shifter vs. the modern one that they build.

    Tom
    "Be who you are and say what you feel because those who mind don't matter and those who matter don't mind." - Dr. Seuss
    "Experience is the mother of wisdom" - idiom
    "Let them that don't want none, have memories of not gettin' any"- Brother Dave Gardner

    Early S Registry #235
    rgruppe #111

  6. #6
    Moderator Chuck Miller's Avatar
    Join Date
    Oct 2002
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    Reseda, CA.
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    For sure, let us know Tom...

    Thinkin about the same deal for mine

    Cheers,
    Chuck Miller
    Creative Advisor/Message Board Moderator - Early 911S Registry #109
    R Gruppe #88

    TYP901 #62
    '73S cpe #1099 - Matched # 2.7/9.5 RS spec rebuild
    '67 Malibu 327 spt cpe - Period 350 Rebuild

    98 Chevy S-10 Utility
    15 GTI Commuter

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