heavy steering at certain points in steering wheel rotation
last week the steering on my e30 325is developed a 'heavy zone' ie. when the wheel is turned 90 degrees (or so) it feels as if the power assist has died, push it a little further and it loosens up again, but once 180 degrees (or so) is reached it becomes heavy again.
i suspect that the steering column u-joint (knuckle or whatever it's called) has developed a tight spot, as one of the four joins looks dry and there is some damage around it's periphery. i'm not entirely sure how this happened. i had my buddies hoist it to remove any suspension variables, manually rotating the steering assembly at the joint produced the same effect as turning the wheel.
where should i go from here? i got a price at my local import shop for a replacement column u-joint assembly: it's ~ $600 (cad) as they stated it to be one piece (i can only hope that that includes the core charge), but it looks to me that it can be disassembled, maybe to the point where i can replace just the joint.
or can i simply grease it? it doesn't appear to have a grease fitting (it's kinda small).
don't get me wrong, i've had this car for a long time and i love it, but i'm a student and $600 +tax is just too much.