Me and some friends decided to look up our rear end gear ratio codes today to look up what ratios we had in our third gens found theres pretty ease, well i have an 89 firebird formula 350 tpi, i looked on my rear end and got the code 9jb but no luck for me, cant seem to find it anywhere not in the book or on this site, would like to know kinda where it came from and whats the ratio, if anyone can help please help, pretty good rear end but would still like to know, thanks