This a new Halibrand 201 V8 Quickchange fitted with a new Limited Slip Differential custom built for me by Quaife in the UK - see https://shop.quaife.co.uk/category/atb-differentials/. 

It was a spare for one of my race cars but was never used. 

The Halbrand centre section, etc was purchased new from Halibrand in 1993 when they were in Kansas.  

Shipping is $115.00 in the US.  International shipping calculated at auction end.  Payment by PayPal preferred.