im looking in on some gears for my 89 RS
i need to know what size rear end i have 10 bolt or 12?
also need to know what size gears i need i wanna be able to drive on street still and get ok gas milkage im running a vortec 350 tbi in a 700r tranny im thinking bout 410 but might go with the 373 i wanna run a 1/8 at our local track as well so need good street-strip combo gears THX

 

get under it and count the bolts i nthe cover, it should be 10, if it's 10 you have a 7.5/7.62 ring gear