After purchasing my '89 Cheyenne, this summer, I noticed a huge amount of slop in the steering. I joined this forum, and found that this is a common malady with this family of trucks. My initial attempt to remedy the situation was replace ball joints, tie-rods, idler and center link. That did tighten the steering somewhat, but not the slop. The next item on the block was the Jeep steering mod. After reading the pros and cons of this, I eventually bought the GM 3500 steering shaft. Still had the slop, but getting better. The only thing left, was the steering box. A lot of threads were saying RED HEAD/ BLUE TOP, but someone from Arizona (can't find that thread again, but many thanks) suggested Benchwork Steering Systems (www.benchworksteering.com). So, I contacted them, and bought one of their units. I installed it, along with a new pitman arm (this may actually have been the culprit all along). Gotta say, the steering now is night and day different, in a nice way!! Thanks again to the person in Arizona for the heads-up