hi there i have a locost with a mk 2 escort axle and diff and would like to know the correct diff for the c20xe and type 9 for the correct power output or as best as it can ??

I have a C20XE with type 9 and seirra 3.62 LSD, can't tell you off hand exactly what the max speeds in gear are but the gearing certainly seems sensible, I would guess its geared to about 120-130mph on 195/50/R14s

Hope this helps

[Edited on 7/4/12 by Pat_T]

Your options are (I think);

4.44:1

4.125:1

3.889

3.777

3.54

Have a play with gearcalc and see which works best for your requirements.