98 rear end

[insco13]

whats the best rear end to run with my rb25. I want to get the rpms down onn the freeway. I've heard that the j30 diff is the one i want. I have my stock se diff and at 80 im up in the 4000 rpms range.

[xxjohns14xx]

stock is like a 4.01, j30 is like a 3.7, and a q45 diff is like 3.4 and will work on a s14 with some modification.

[xxjohns14xx]

with a j30 your rpms at 70 maybe will lower 250 rpms.