This is a 12/41 (3.416:1) ratio crown wheel and pinion. it makes a welcome but moderate 8% plus upgrade to the earlier standard 11/41 (3.72:1) unit. This later ratio was offered midway through Bentley R type production, then standardised from chassis B1 YA, and used in RR Silver Dawn and later Silver Wraith SWB models. It provides approx 50 mph at 2000 rpm / 62 mph at 2500 rpm with standard 6.50 x 16 tyres and transforms the Bentley MKVI, earlier Bentley R Type and RR Silver Dawn and is suitable in hilly or mountainous regions where our 13/40 (3.076:1) axle may be just a little too highly geared.
Although we are offering the crown wheel and pinion we strongly advise the purchase of one of our reconditioned differentials. This is because they are notoriously difficult to successfully overhaul without the correct specialist tools and parts. Please speak to us before placing your order.
Ideally, where possible, we would recommend that you ship us your old axle (differential and half shafts) to be overhauled. We can then assess the condition and advise accordingly.
We were extremely privileged to be offered the chance to continue Norman Geeson's axle building business, Crewe Classix Six, when he retired. More details can be found here.