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Thread: transmission repair

  1. #1

    transmission repair

    My 70E has a bad 1st gear synchro and perhaps needs some repair to reverse. I had an estimate for $900 parts and $500 labor. All gears shift as they should with the exception of 1st. I must almost be at a stop to get into 1st gear . I'm good at most all other repair but know nothing about the rebuilds of these transmissions. Is this reasonable? Any advice is appreciated.
    Thanks
    Rich
    rich-911

  2. #2
    Senior Member
    Join Date
    Oct 2002
    Location
    Suffolk, VA
    Posts
    380
    I have two recommendations:

    1) Make sure the clutch pedal is adjusted correctly

    2) For that money, you can alter your driving habits and live with it. What I mean here is that if your 1st synchro is that bad, you should shift into 1st at stoplights and stopsigns BEFORE you come to a dead stop. By shifting when the gear rpm (axle) matches the engine rpm, you actually don't need a synchro at all. I drove one of my early cars that way for years and actually still do it today.
    1970 911S Coupe (Burgundrot) (sold)
    1967 911 Coupe (Light Ivory) (mostly gone)
    1966 911 Coupe (Sand Beige) (sold)
    Van Diemen RF99 Formula Continental
    Citation F1000 on the way
    Van Diemen Hayabusa SCCA Formula S (sale pending)
    Other Early 911/912/914

  3. #3
    Buy 101 Projects for your Porsche 911; it has do it yourself instructions for fixing 1st gear in a 901.
    Kenik
    - 1969 911S
    - 1965/66 911
    - S Reg #760
    - RGruppe #389

  4. #4

    Bushings

    Hello: What I would do first is check all the shift linkage bushings and the shift rod to make sure everything is correct. The bushings get loose or just crumble away. The shift rod ends can come loose at the welds. The set screws also can be loose. Check all of these then adjust your clutch. Lastly try some different trans fluid like Swepco,Redline. This may make the difference as well. Thanks Eric

  5. #5
    Whether you DIY or not, repair it before you ruin the first reverse slider. The part alone is over $500 and if the gears a grinding you are damaging that part. All of the suggestions are good except the one that doesn't repair the problem.
    Try the simple items like clutch cable and linkage problems but my guess is that your syncro is shoot. first reverse sliders are damaged so often that it is getting hard to find a good used one. We have over 100 901 transmissions in stock and very few have good used sliders in them.
    Good luck
    Henry Schmidt
    SUPERTEC PERFORMANCE
    445 Golden Road
    Fallbrook, Ca. 92028
    Ph: 760-728-3062
    Fax: 760-728-3063
    Email: supertec1@earthlink.net
    Web: supertecperformance.com

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