Manual Ford Falcon XR6 0-200 km/h (naturally aspirated)

The car has a full exhaust, intake, stage 3 CMS (Crescent Motorsport (In Sydney)) cam, & dyno tuned by CMS Not sure why it shudders in gear 1 so much when trying to launch, its got a bit of a clunking problem despite the rebuilt lsd diff and new driveshafts.. perhaps the tyres are simply too wide. UPDATE: i know why it shudders - it's called axle tramp (which is normal and quite common in rwd cars), and i've already got rid of half of it + the clunking is pretty much gone.. Apparently, stiffer gearbox/engine/diff mounts is what you need to completely stop the tramping.