I would like to keep my cvh without going to zvh just to fit the getrag 6 speed, I've gone through 3 bc box's in mine, I think it also depends on the way you drive that will show how long parts will last, I think the best person to ask would be Simon from sitec, as I asked him about getrag to cvh conversion he posted back saying it can be done but it's alot of work and the cvh sump would need modifying in some way.. Hope this helps
(jonboy)