right guys here the score... i have a mk5 xr3i rally car standered box but it has poor ratios ( i did raf wittering last weekened and never got out of 3rd lol) and no lsd.
i also have a series 1 rst box. belive this has a lower final drive ratio and would be a bolt on fit....
but is it possible to put ib5 gears onto the bc mainshaft and if so whats the best set of ratios puma1700?

am tryin to keep this one cheap as i dont want a fortune in this as a car i have my mk1 for that lol
cheers guys