Did you check the number on the side of the box? Should be a 60 I think?

Well one of the first things I did when I got this car was machine up a new nylon bush for the gear stick lever as the old ones were missing (allowing the gearstick to wobble 50mm before actually moving the internal mechanisms). Now with the bush I made its tight as and the gearstick has about 2mm free play. But under load (up hill, or hard acceleration) you can hear a slight rattle in the gearbox that you can quieten (and feel at the same time) by holding the gearstick and slightly applying load to it.

So I think the shifter forks are loose but what you you guys think?

The box is a F4W56A I think.

I'd rather have a 4 speed on the A12 as I would be loosing more of whatever little power it makes if I had a 5 speed.

motor and box will come out together easy enough

the rattle of the shifter is not just because the little plastic bushes at the gearstick pivot point have broken up and fallen out is it? any other issues with the gearbox?

the 4spd with smooth bellhousing (not webbed) is a very good 4spd

Hey all,

I’m getting closer to rebuilding (and working) the A12 in my B310 Sunny and have thought of this. Seeing as the gearbox rattles under load (shifter forks worn/loose?!) would it be feasible for me to rebuild it (the 4 speed) or should I be better off getting something else (is there another gearbox that will bolt straight up to the A12 and that is easy to get?)

Also if I were to freshen up the 4 speed, what would there be available in the way of spares (seals and bearing I would think I could get from a decent bearing supplier right?).

Secondly could I remove the gearbox while attached to the motor. Like remove the cross member, tail shaft and misc stuff and pull the motor with the gearbox up and out of the engine bay – or wont this work in a B310?

Thanks if any one can shine any light on this.