Hi, I've posted loads of info on the Sierra Front Diff :
http://www.super7thheaven.co.uk/Sier...t_Differential

http://www.super7thheaven.co.uk/blog...ntial-a41.html

There should be loads of info on what cars they come from, part numbers, exploded diagrams etc.

My Sierra 3.92:1 tag reads:
V90BB AA C9P5A CG02It came from a Sierra Sapphire 4x4 GLS 2.0i DOHC if that is of any help.
The FINIS number for the 3.92:1 is 1661121