Typ 89 front subframe bushings R@R question

[radek@istar.ca]

Hi guys;

How much work is it to replace the front subframe bushings on an 88 90Q?  The car has
developed a 
nasty jolt in the steering, most noticeable when stationary.  You turn the wheel and it
goes "clunk", 
something gives or relocates with a metalic sound.  Having replaced top strut mounts,
control arm 
bushings, ball joints and complete tie rods, I suspect either the steering rack itself of
subframe 
bushings.  Or is there anything else I should take a look at?  Any input will be greatly
appreciated.
TIA.

Radek
88 90Q
91 V8Q 5-sp.