I bet at least some of my traction issues stem from the fact that I have an
Inline 4 motor transplant motor in my 84.  Dunno the weight of the WBX
motor, but the Cabriolet  4 banger seems incredibly small and compact, which
probably makes the rear end on my van a bit lighter.  Also, that motor is
laid over to the left at a pretty steep angle, which further loads the left
rear over the right rear, I bet.
  Don Hanson