bloody hell, this is a cracking argument

back to the first question, I maybe wrong, but it looks like your looking for a cheap gearbox. My advice if this is the case. Dont even both with the RST box or the XR3 box, as there the crappy chocolate gearboxes. If you not fused about the LSD, get a IB5 gearbox. If will be much better and take a bit more stick then the (BC) RST box.

if you did want a LSD, just use the RST LSD and put into the IB5 box. then you got strength and traction.