hy, ive got a hypoid crown gear thats running with a 3/16 offset and a paralell pinion, and its whisper quiet. using the old *** paper to set the backlash. i,ve also got a brand new o/s 3-1 bevel gear and pinion with a 3/32 bore and 2mm pinion. that i,ll use on an indy offy body that i,ve got. 300, i dont get the bit where you say" that means the pinion teeth can only be the correct size for the crown at one diameter". you,ve lost me a bit there. could you elaborate for me. i know slot it crowns arn,t strictly speaking a 48 pitch, but with clever engineering to allow different tooth pinions in the 5.5mm dia to mesh perfectly well. i believe that a conical pinion on a normal crown, allows you to run a certain amount of offset, is that right?. john