so where is the casting number to tell which gear box is which sereis, its cold and 4 out of my 6 g/boxs are at my mates place.
are the on the top plate or somewhere else

usually on the side of the centre housing (drivers side) from what ive seen anyway

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thats very true, and would be the determining factor

Yep, the 60-series at least has it on the side middle like 1200rc says.

Some also have a number stamped on the top of the bellhousing flange.

Here are some photo comparisons:



5-speed comparo

Thanks ddgonzal by the way (I know a bit late)

The info did help out a bit.

I've decided to try the box that is still attached to the A15.

It should handle more torque - and if it is a 60L (which I will check this weekend), there is less gap between 3rd and 4th - which is what is really needed for the race track (for me anyway) as 4th never seemed to pull hard enough with the A12, maybe the power increase will fix that