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Thread: getrag & tremec both make a T56-6spd?

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    metalskin's Avatar
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    Default getrag & tremec both make a T56-6spd?

    if so which is the better box? in the vz commodores with 6spd manuals do they use same box in the V6 as in the V8`s? also what kinda grunt are they rated for, cheers.

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    Ok well the T56 transmission is a Tremec transmission used by General Motors. The Getrag 6 speed manual is not a T56. The Getrag 6 speed is used by Toyota, Mitsubishi, Dodge, Ford, and it is also used by Pontiac (GM) and many others. But each company uses a different version of the manual. So it depends on exactly which Getrag 6-speed variant it is.

    The VZ V6's use a D173 Aisin 6-speed Manual Transmission. This transmission is built in Japan and the SV6 was the first car in the world to use it. Ratio's are as following:
    First: 4.48
    Second: 2.58
    Third: 1.63
    Fourth: 1.19
    Fifth: 1.00
    Sixth: 0.75

    The VZ V8's use the original Tremec T56 6-speed Manual Transmission which has been in use since the VT. Gear ratio's are:
    First: 2.66
    Second: 1.78
    Third: 1.30
    Fourth: 1.00
    Fifth: 0.74
    Sixth: 0.50


    The VZ Monaro however uses an M12 version of the Tremec T56 6-speed Manual Transmission which generally in the GM empire is not used in applications of much over 400hp, but it can handle more. Gear ratio's are as following:
    First: 2.97
    Second: 2.07
    Third: 1.43
    Fourth: 1.00
    Fifth: 0.84
    Sixth: 0.57

    The M12 T56 would be the strongest of the transmissions that Holden use.

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    thanks for reply chief, apreciate it. ive bought a box which is coming from over east, the ad reads like this-

    "Getrag 6 speed manual gearbox to suit alloytec sv6 VZ commodore

    Complete box less clutch and shifter nearly new no damage at all."


    what do you think?

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    Hmm make sure its not the 5 speed Getrag manual as used by Holden just in case.

    Other than that, they may have confused it with the 6 speed Aisin manual from the SV6 as its a little known transmission. I would say this would be the case if its through private sale.

    Or if it actually is a Getrag 6 speed, it would be a BMW Getrag 6 speed or a Ford Getrag 6 speed.

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