To BA10/5 or not to BA10/5?
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  1. #1
    Fellow Frogger!
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    Default To BA10/5 or not to BA10/5?

    Hi All,

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    Okay, so my '75 504 GL currently has the standard BA7/4 gearbox, but I have a BA10/5 in good condition in the shed.
    I understand the general consensus is that the BA7 is the better unit. But if a 5 speed is available would that not be better? Regardless whether its a 7 or a 10? I should point out that the car is only ever used for 'Sunday driving'. I'm not interested in off the line performance or anything like that.
    Appreciate your advice.

  2. #2
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    Only if you do a lot of country driving on flat straight roads. Would be more worthwhile if you were to fit a 505 (4.1) diff as well. The 5 speed is simply a 4 with overdrive 5th added.
    Even then the 505 is struggling with the tall 5th and XN engine, sometimes you have to go back a gear, or even two if you wait too long, on a hill where the 4 speed would have gone up in top.
    Graham


    Quote Originally Posted by tonch504 View Post
    Hi All,

    Okay, so my '75 504 GL currently has the standard BA7/4 gearbox, but I have a BA10/5 in good condition in the shed.
    I understand the general consensus is that the BA7 is the better unit. But if a 5 speed is available would that not be better? Regardless whether its a 7 or a 10? I should point out that the car is only ever used for 'Sunday driving'. I'm not interested in off the line performance or anything like that.
    Appreciate your advice.

  3. #3
    Fellow Frogger! 1pugnut's Avatar
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    I fitted one in a 1978 504 that i had

    it was great having the 5th gear on the expressway

    I shortened the the shift and it made the box feel a bit harsh.

    regards Jamie

    series 2 405 mi16
    205 si
    series 1 205 gti
    series 3 205 with a gti6 motor project
    1970 404 ute 504 ti motor project
    parts cars 2 205 si's 306 sedan
    2004 206 gti180

  4. #4
    Fellow Frogger!
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    Changing to a 5 speed is a fantastic improvement in a 504.....if as Graham W says....change the diff.

    Dont believe all you hear about the 10/5 box.
    I have one in one car that is as smooth as any 7/5 but another that is a bit 'agricultural'...both are low mileage and in good condition....it is a bit of luck I think if you get a smooth one.

    Towing, I think most people would agree the 10/5 is a stronger unit and the gearing is slightly better in 5th I think.
    Put it in...you wont be disappointed.

  5. #5
    Fellow Frogger! BigH's Avatar
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    I have also done it in a 504 and agree entirely with Bob.

  6. #6
    1000+ Posts Shobbz's Avatar
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    Agree that it was a good box. Bit of whine noise compared to the ba7

  7. #7
    Fellow Frogger!
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    Okay I'm convinced. I'll do it. A good time to do the clutch also I guess.
    Is it a direct swap or will I need a selector, bell housing? Anything else?

  8. #8
    Fellow Frogger! 1pugnut's Avatar
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    Quote Originally Posted by tonch504 View Post
    Okay I'm convinced. I'll do it. A good time to do the clutch also I guess.
    Is it a direct swap or will I need a selector, bell housing? Anything else?
    The bell housing will fit

    I used the 504 selector but mine was the late 504 selector that mounts to he back of the gearbox and then fitted in a rubber mount on he body it is similar to the 505 selector

    I think you will have the selector that mounts to the torque tube I don't know if that selector will work or not

    Also check that the torque tube will mate up to the gearbox you may have to machine the rear extension housing

    I also had to widen the Back of the gearbox tunnel for the rear of the box to fit in .

    I think that's it

    Regards jamie

    series 2 405 mi16
    205 si
    series 1 205 gti
    series 3 205 with a gti6 motor project
    1970 404 ute 504 ti motor project
    parts cars 2 205 si's 306 sedan
    2004 206 gti180

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