I really don\'t know if this belongs here but...
Between 79-85 were there different rear diff ratios for the FB besides the difference between AT & MT?
Yes,You can get quite a few combo\'s.
I am able to source them if you like.
There are 5.1, 4.875, 4.4, 4.1, apart from the stock ones.
I have a 4.875 almost new ATM. I may want to keep it though.
Mazdatrix and Racing Beat can also help you.
Kind regards
Carl