there were a lot of different rear end ratios listed for falcons, 3.50 is very common, but there are some 3.89's and such. i have seen some listings for 3.00's too. keep in mind that you only have a 2 speed tranny. i am spoiled with a t-5 behind my 170 (NOT a direct bolt in!) and 3.00:1 8"rear axle. more gears and the tall rear ratio makes highway travel very pleasant. a c-4 auto or the srod-4 manual would give you great results, provided you don't mind a little wrenching. i can't recall when the c-4 came along or how easy it would be to swap it. yank probably does know. the srod-4 overdrive manual came in granadas and such. a little modification and a tranny crossmember are needed. use the 3.03 bellhousing and turnthe retainer down a few thousandths. a 1983 4 cyl mustang clutch disc is also needed. | 
