Sierra diff

[ivorbigun]

Hi all 

I have a rear diff that's going to be sold just want to identify it. 

Searched the webb but not turned anything up

It's push in shaft 7" and the tag just says. i=3.22:1 I know that it's a 3.22 to 1 ratio but what does the i= mean  

[phaeton]

Input?

[IanS]

As the design was done in Germany I tried to come up with a German word for ratio that began with i but failed.

The Ford wiring colour letters make sense when you realise that the wireing was designed in Germany.