OK sounds sad ---you can get a 4 planet geared diff head and you can change just the Carrier if your ratio is hard to find ------they a lot stronger than then the standard one-- the planet gears they can be replaced ( you know that) there are a number of fords that use the same size planet gears--- i think zephyr's and transit vans & Mark 2/3/4/5/ FORD CORTINA's but its been a while ---------
when setting the crown wheel and Pinyin gap use some ( led wool) led wire or led sheet --- say 1/8 inch wide and 1mm thick led has the advantage of loading the mess -- - and wound it in the crown wheel and Pinyin mess and use a micrometer ---say have 2 Tho gap ---watch out for the mess on the
2 Axel's bearing on the Carrier they can have to much mess or not enough ---when adjusting the crown wheel mess ---
bearing blue should be used on the crown wheel as well ---
I welded a bolt in the diff housing and bolted a gear box magnet in the floor of the diff housing IT works
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hope that helps