The axle code in a MA70 will be Gxx4 or Gxx5.
The xx determines the axle ratio. This will be, as I recall, 28, 30, or 31, which is (By memory, I may be wrong) 4.300:1, 3.727:1 and 3.909:1 respectively. My car's axle code is G285, and it came with a 4.300:1 limited slip.
The G indicates...