Flaming river

Been there , done that ( researching ) .... i was also thinking of a flaming river box... Firm feel has 1 more 20 to 1 gear ratio left ... i figured ... by the time i send my box out ... have it rebuilt.... it was going to be near 550-600 .... from firm feel .. and you are still left with original box...
If you buy a flaming river .. everything is new .... but a better responsive gear box...
i do believe if your vehicle is 70 or newer .. you will also need a pitman arm to work...
I think FR is better option