Posted 22 May 2012 - 11:56 AM
Back L/H is indeed left hand thread, but the problem here is supposed to be the front, which is definitely R/H thread.
I am going to suggest something which may seem daft, but has the laws of physics behind it. Wheel on ground, chocked. Now take a SHORT breaker bar (or a long one but apply the load close in, i.e. within the wheel diameter), and arrange it forwards from the hub, and as close to horizontal as possible. Now, get as much weight on it as possible (stand on it), and add some hard whacks with a hammer too. The hammer blows can be at a larger radius, to avoid hammering your foot, and you will need two people obviously.
Why might it work? Just suppose the torque needed to shift the nut was 300 ft lbs (ok, it will be way higher in this case!) With a 3 foot breaker bar, you would apply 100 lbs, which would generate 300 ft lbs of torque, but only add 100 lbs download to add to the friction between tyre and ground. With a 1 foot breaker bar, you need to apply 300 lbs, which puts 300 extra lbs on the tyre contact patch, giving lots of extra friction.
Last desperate measure, but I had to do this once. Jack the car up high on the left, so right hand wheel is carrying as much weight as possible, Left hand wheel may be off. Breaker vertically upwards, and pack between it and rear of inner wheel arch with a heavy block of wood. You will need to have steering slightly to left. (That way the reaction will not try to lift the car). Hold the wheel tightly. Reverse gear, and a few quick jabs of the starter.
If all else fails,use an angle grinder to cut away as much of the nut as possible without going right through to the thread. When only a thin section is left, it will be loose.