I know what you meen.. Right no i run and all alloy adjustable diff that allows me to completely lock the rear end if i wish to. it's a pretty nice upgrade. ofcoarse if you want your one wheel wonders back just loosen the allen screws a bit
look closly at the rear and you can see it, the casing has a hump in it for the allen screws sit, so you can make your adjustments
P.S Incase you want to purchase this down the road. the part number is 8485/05 But most sites i went to do not show a pic of it anymore [
]