do we need to shorten both axles or use the short side to become the long side??

Thanks for the info PIGDOG..

1200 diff is 1310mm ish
r31 diff is 1465mm ish
so therefore 155mm needs to be cut out

pintaras had 25 spline diffs, autos were 4.11:1 diff ratio, manuals were 3.9:1

skylines had 28 spline diffs, autos were 3.9:1 and manuals were 3.7:1

brakes and housings are all the same

brake lines are pretty much diff specific...so the lines on the diff will need to be made to suit a 1200, rather than hte other way around

I'm thinking of putting a r31 skyline diff in my 1200 sedan just need to know a few thing / specs on how to do it ( cut, weld and so on.. )
and also if all r31 diffs are the same ?

My 1200 has had a R31 diff in it before, so all the new brake lines are there already for an easy fit ( well i hope ) =)

thanks...