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Thread: C5 Need to replace Syncros in 6 speed tranny how do i do it ?

  1. #1
    Join Date
    Oct 2017
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    2

    Default C5 Need to replace Syncros in 6 speed tranny how do i do it ?

    Hello , i just bought a 1997 c5 manual tranny and the syncros is out of 2 gear can anyone advise me on how hard it is to pull tranny and replace syncros and any other problems i might have tearing this apart ? car has 165 K on it? Thak you Tod

  2. #2
    Join Date
    Jul 2008
    Location
    San Antonio, TX
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    1,950

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    It is a fairly involved job to just get the tranny out. I'm not sure on the particulars of the internals on these trannies, but you will likely need some specialty tools (like a press) to separate some things.

    For tranny removal, you need to remove the rear cradle assembly. To do that, the front assembly needs to be dropped also. Basically, you're nearly removing the entire powertrain in one "piece." It can be done with jacks, jack stands, and stuff in a garage, but it is much easier with a hoist. Try doing some Google searches for videos and stuff. I'd also invest in a set of Service Manuals for the car. This will give you all the specs and stuff you'll need.
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  3. #3
    Join Date
    Apr 2018
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    17

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    That sounds a challenging job.

  4. #4
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    Dec 2011
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    New Haven, Ct
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    HI there,

    It is challenging and you require a few special tools, including a puller for the 5/6 gear. That being said, how far are you along???

    Allthebest, Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
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  5. #5
    Join Date
    Aug 2020
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    1

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    I can't say what's wrong. But usually when you lose a whole gear, it's not an easy fix. Most transmission issues tend to require a rebuild.

  6. #6
    Join Date
    Dec 2011
    Location
    MI
    Posts
    660

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    Make sure your shifter is properly aligned and the shifter bushings are not rotted out. The bushing rot is common as the tunnel is very hot and degrades the rubber. I upgraded mine to polyurethane and never looked back.

    Also, if you are getting a grinding in second, make sure your trans is hot and not cold. If cold when it happens, do not shift that aggressively until hot. This is also common but is not an issue with the trans.

    Lastly, upgrade the trans fluid to a synthetic fluid this also helps with shifting. Has the fluid ever been changed on the car before?

    If none of this applies, then yeah, you got a bad synchro but you should still do all the above if never done before or while the trans is being fixed.

    1998 Six Speed, Torch Red Coupe

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