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Stripped bolt hole for transfer case on transmission

Posted by ErikTande, Feb 26, 2020

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  1. ErikTande

    ErikTande Supporting Member

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    One of these bolts on my transfer case is stripped, I must have over tightened it. Can I drill, tap and helicoil these without any issues? There's no oil / fluid passage there, right? I circled both because i don't remember which one I stripped.

    stripped hole.jpg
     

    Street Build 956  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM

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    1990 Mitsubishi Eclipse GSX
    13.2 @ 105 · 1G DSM
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  2. PLDSM

    PLDSM Proven Member

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    Warren, Michigan
    I have done this many times. Have done both the helicoil method as well as welding and tapping. If you do weld and tap ensure your dead on center so you don't have any issues with bolting in the transfer case.
     

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    1990 Eagle Talon TSi AWD
    awd · manual · 1G DSM

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  3. red_devil

    red_devil Proven Member

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    Richmond, Virginia
    Mine are all helicoiled as it provides a more reliable and stronger thread. Just make sure they are straight.
     

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    1995 Mitsubishi Eclipse GSX
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  4. greddy_1700

    greddy_1700 Proven Member

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    Regina, SK, Canada
    I did this before also. I couldn't get the proper size helicoil for over a week and needed the car running, so I tapped the hole in the next larger size in Imperial course thread and put in a new grade 10 bolt. Just another option if you cant find the right size kit locally.
     
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  5. Mello

    Mello Proven Member

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    Albuquerque, New Mexico
    My first choice would be Helicoils if the holes aren't oversized too much so the Helicoils won't fit poroper. I would also Helicoil all the holes while fixing the stripped holes as well. My opinion is all threaded holes in aluminum should have Helicoils. If you have the resources make yourself a drilling guide block to help keep the drill straight.
     
    Last edited: Feb 26, 2020
    ErikTande likes this.
  6. tk106

    tk106 Supporting Member

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    One of mine had a helicoil in it and I’ve had the tcase in and off several times without issues
     

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  7. ErikTande

    ErikTande Supporting Member

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    Centennial, Colorado
    Good tip, thanks!
     

    Street Build 956  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    4K  7

    1990 Mitsubishi Eclipse GSX
    13.2 @ 105 · 1G DSM
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  8. spoolnmotorsports

    spoolnmotorsports Probationary Member

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    Joined Feb 12, 2020
    Towson, Maryland
    Heli coil it, it will be fine. As stated, just make sure its straight.
     

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