He's shown you an S12 diff thats why it looks different.

All you can see from memory of inside is very little as there are only 4 holes of about 1.5" diameter to see inside with

Drive shaft
 

On the diagram you posted showing the S13 inners into S12 casing you used the drivers side inner cup from the S13 would using the S12 original drive shaft work if the splines were machined to take the circlip and maybe shortened or do you definately have to use a short passenger side S12 drive shaft onto the drivers side, the best bit is both my drive shafts measure 10" so which is the short one????

Actually I didn't, that's an S13 open diff.

30psi is right though, if you can turn the two output shafts in opposite directions without breaking a sweat then it's unlikely that you have one of the standard S13 vLSDs. Or if you do, it's not working very well.

The photo you sent me last night doesn't look like either the standard open diff that I've seen or the Standard vLSD.

http://i109.photobucket.com/albums/n...818lsd0018.jpg

Try popping the output shafts and comparing them, send me photo if you like and we might be able to better guess what you've ended up with.

The drive shafts should be two different lengths (about 2" difference) unless your car was already retro-fitted with an LSD and then they might measure the same, however 10" seems too short but that's only from memory.

http://img.photobucket.com/albums/v2...monster321.jpg
http://img.photobucket.com/albums/v2...monster323.jpg
http://img.photobucket.com/albums/v2...monster322.jpg
as you can see the shaft at the bottom is the shorter passenger side, but when they are in the diff you can't tell the difference.

Are they two short ones Shaun?

EDIT - I remember the difference being more obvious than that.

no mate, top one next to the blue trim is longer.