M8 X 1.25 would be my guess.

that's about the only thread pitch used n VW's in an  8 mm diamter bolt.
6mm is 1/4 inch ...so likely too small.
9mm diameter ...almost 'no such thing.'   almost.

S.

On 12/14/2012 1:33 PM, TJ Hemrick wrote:
> Crazy as this sounds (the question in general AND just the issue of trying
> to find it out), does anyone know the thread pitch of the empty bolt holes
> on the AUTOMATIC transmission?  There are only two or three above and
> forward of the CV joint on the right side of the van.  I bought a small
> handful of a variety of bolts and not one of them fits.  Now that the van
> is not driving, it's not too easy to take it to the store and find the
> right size.  Not that I did even when it was driving!  I they're probably
> (just out of memory) about 6-9 mm in diameter on the shank of the bolt.  I
> suspect most of them have the holes but are unused but just in case, mine
> is an 87.  Sorry no pix but I don't know how to get a pix on the site
> anyhow...
>
> Thanks,
>
> TJ
>