Paul, it's not a hard job to take the diff out of the live axle if you have a basic spanner knowledge, and gives you a chance to have a look inside to see what baffling is there. Simple steps. Disconnect Rear brake lines & handbrake.Remove brake shoesRemove the 4 halfshaft flange retaining bolts.split the flange and withdraw the half shaft assembly, might dump oil.repeat for opposite sideCheck bearings and halfshaft for straightnessDisconnect propshaft from diff,by removing the 4 prop bolts. & tie up into roof of tunnel. undo the outer bolts around the perfifory of the diff.split the diff flange, pull forwards, (careful its heavy) swing the nose upwards & lower the diff out.While the diff is out clean out the casing and you can check for baffling.installation is the reverse of the above.I typically put 2 litres (less what I spill) in the axle rather than the 0.9l in the manual.if you use sticky tyres and want to get the confidence in the rear axle then the rakeway conversions is a substantial upgrade which is worth while, in 3 years I managed to bend two sets of standard half shafts doing track work. but if your just doing road work the shimmed half shafts should be fine for standard power.