I just recently replaced the steering gear on my 1998 K2500 Suburban with a Redhead unit and couldn't be happier. The Sub has about 123,000 miles on it and I had replaced just about every front end, steering and suspension part but still had sloppy and darting steering. The shop that I use has been in business a long time and is very reputable. The owner told me that ALL of the major parts stores carry steering gears made in the same place in China and he considers them all to be junk, so much so that he will not warranty them because it usually takes 3 or 4 to find a good one.
He suggested a Redhead and it made a world of difference, all the slop was gone. The last piece of the steering puzzle was disconnecting the EVO sensor (waiting on GM bypass kit), which solved the darting I was experiencing.
Redhead shipped the gear very quickly and also was quick to refund my core deposit as soon as they received my old gear. They are more expensive but in my opinion they are worth every penny.