The WD is an open carrier (non-posi) rear end which means that your car did not include posi-traction. I don't know if a 2.93 is available, I have found 3.08, 3.36 and 3.55 ring and pinions through
Randy's ring and pinion, I would give them a call and verify the open carrier spider gears will work from as low as 3.93 to a high speed highway gear like the 2.93.
I would suggest a 3.36 or a 3.55 to give you decent 0-60, I had a friend rebuild both of my rear ends so I'm not completly up to speed on what will or will not work.
