help on what lsd ratio m50?

[G4V11N]

Hi

GoING to be using a getrag 260 with a M50b25 non vanos in a touring.. 16" wheels and unsure what's beat ratio too use?

I have a 3.91 and a 3.15 lsd at hand bur unsure if these are what's best too use.

Any help?

[ross_jsy]

3.91 will work. You will need lower geared diff as 5th is .81:1. If you were using a ZF unit they have a 1:1 5th so you need a higher diff (say a 3.15).