sorry not been on for a while had some work done on my old car turned manifold and turbo round and a fuel pipe came off and the hole car set on fire anyway ive got a 98 typr ra vspec and if i turn the diff controler on rear wheels and 1 up its fine soon as i turn it up to 4 wheel drive and brive it slow round corners it judders like it looking the wheels been told it will do that but to me it aint right could it just need greasing the car been stud for a while need help plz

 

They are all 4wd, all your doing with the centre diff is going from open to locking all 4 wheels.
Go have a peek in the gen tech archieves about how to use the dccd

Tony

 

ok ta m8