I have a 77 280 with real bad steering wheel shimmy.all balljoints,tierod ends,
bushings are new.I have had the wheels balanced and the problem is still there.It is most noticeable around 55 to 60 mph.Any ideas?
You can do this and it takes most all the play out. Not very hard, the procedure is in the Haynes, Chitlons, or Z service manuel. Being a manuel rack it is not hard to clean out the old grease, replace a few seals, refill with grease, adjust the tension nut on the top, replace the boots to keep the new grease clean. Did mine in about 2 hours, feels like new. They wear very little unless it has been abused.
Check out the tires first. All tires are put together by hand and suspected of being defective unless proven otherwise -- swap fronts with the rears and see if any change. I have many horror stories with tires in my limited (30 years)experience with radials.