m22Z autogear

Discussion in 'Transmission & Driveline Topics' started by David Miotto, Sep 16, 2019.

  1. David Miotto

    David Miotto New Member

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    Would love to hear any opinion regarding ;
    1970 z28 c/w m20 , 3:73 , 3000 rpm at 60 mph ,not very highway friendly.

    trying to decide to go to a m22z auto gear c/w with a 3:23 rear ratio.
    approx. 2450 at 60mph.

    Will obviously keep the m20 and 373 for the originality,but want a little more hwy cruise comfort with the new setup.

    Should still have nice punch out the hole with new setup.
    Bottom line close to $5 grand for 500rpms ??

    David
     
  2. G72Zed

    G72Zed Veteran Member

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    For that initial cost, perhaps a 5spd w/OD would be a potential option to look into. keep your rear end/gear intact.
     
  3. big gear head

    big gear head Veteran Member

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    I'm running a M23Z in my Camaro with a 3.70 gear and 31 inch tall tires. Works well for me.
     
  4. COPO

    COPO Veteran Member Lifetime Gold Member

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    4th gear is 1:1 ratio in the M20, M21 and M22 factory Muncie's. I take my daily driver for long highway runs instead of my 70 Z28 and I won't cut the floor for a 5 spd. I've owned mine since 1981, why change now is what I tell myself.

    $5 G's for 500 rpm, that isn't the way to go. With that 5 Grand, if I were you, I'd buy a 5 speed.
     
    Last edited: Sep 16, 2019
  5. czizza

    czizza Veteran Member

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    I had a 79 with ST10 and 3.73 first gear was 2.82; I swapped out for a TKO500 a new cross member and driveshaft and I have .68 OD ... it is strong enough for me to drop the clutch at 5K and pull the wheels up 2-3 inches.

    [​IMG]
     
    dave@ztech likes this.
  6. 76z28

    76z28 Veteran Member

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    I love my 6 speed :D
     
  7. Dave Nelson

    Dave Nelson Veteran Member

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    Keep the Muncie and go with 3:07 or 3:08 gears.
     
  8. xten

    xten Veteran Member

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  9. Dave Nelson

    Dave Nelson Veteran Member

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    Keep in mind if you go with Gearvendors you will need to cut the tunnel brace for clearance.
     
  10. G72Zed

    G72Zed Veteran Member

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    That combo would give an overall first gear ratio of 6.77, not good, but 4th gear with the 3.08 would be great.

    That's why I mentioned the 5spd w/OD. The Richmond SS or TKO600 would be like having a 4.85/88 first gear and a 2.87 in 5th for the Richmond, or 3.06 with the TKO's .82 OD.

    And for the extra $750 vs the GV, no floor cutting/pinion angle issues with the Richmond.
     

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