i have a fairly modified datsun 1000 wagon to which a borg warner diff housing and 3.9:1 center from a 120y and cortina four speed box is fitted. I was thinking of trying to get a bit more top end but i cant find anything lower than a 3.9, i was thinking somthing like 3.5:1 any ideas?

a 5th gear?

or bigger wheels, how does a cortina box fit an a-series

iv thought of that but the cost and hassle are too much

its pretty ugly but she holds the grunt, its got 13/7 and they just fit

What engine have u got in it ?

iv got a a15 turbo using a draw thru srtomberg carb running 30+ psi

geez man u only tell us this now!

wouldn't happen to be red with 'rebel' wheels?

about the diffs, that series BW was used in many 70's Jap car assembled in Aus. I've only looked for lower ratios (3.89, 4.1, and 4.3) in corollas, but I think some other larger cars like Coronas used the same BW diff too - they might have a taller ratio. They'll all be wider housings than the 120Y, but you should be able to swap centres or crownwheel/pinion.

Where does this datto 1000 wagon live? I saw a cool red one here in tasmania is it yours.