Gearbox interchangeability ? - Alfa Romeo Forum
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Gearbox interchangeability ?

It has been suggested that Boxer gearboxes are not interchangeable across the model range because the speedo sender units are different.

If I want to adapt an early inboard Sprint gearbox to my 33 by using the driveshaft flanges from my gearbox can I not just swap over the speedo senders as well ? I don't believe that Alfa would have made a huge investment to change the machining just for a different speedo sensor that is worth just a few quid. Are there any solutions ?


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Re: Gearbox interchangeability ?


Think you need to swap the diff as well, as that is what trigger / drives the speedo pickup.

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Re: Gearbox interchangeability ?

Hi Dino

Yes you can convert an alfasud type gearbox with mechanical speedo drive to a 33 type with electronic speedo sensor by swapping the output flanges and the cable drive unit for the sensor.

BUT remember that the clearances in the diff are set by the odd shaped shims between the output shaft flanges and the gearbox case. So you really should pull the gearbox apart and check the diff clearances with a dial gauge, fit the correct thickness shims, and reassemble. If you don't, chances are your gearbox will start making bad noises after a while and then you'll need a new one.
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gearbox , interchangeability

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