Ford Sierra 7" Crownwheel & Pinion Assembly. Kit Cars with Sierra 7" Diff. Caterham 7 with Sierra 7" Diff. Westfield 7 with Sierra 7" Diff. No of Teeth: 9/40. Ratio: 4.44. Manufactured by one of the best spiral, bevel gear manufacturers in the world, established in 1955, TUV certified, TS EN ISO9001-2008.
