The red head went on with a psc pump , lml booster , gas truck cooler and synthetic ps fluid. Im now at 112k miles and just swapped the redhead for the hd PSC XD steering gear and have 34.5" tires. I still cant turn lock to lock when at a stop but i can turn more than i could with the redhead. The trucks steering now consists of Lml hydrobooster
It sounds like the PSC box is a good upgrade, but that leads to new pitman arm, which can lead to new center link etc... I would rather buy once, cry once, than piece meal parts which might now match / work well together. Thus, the questions about the different center link designs.
Nothing beats PSC's box and pump. The pump puts out higher flow than the GM pump and their box is the only actual upgrade over the OEM box. The internals in the PSC box are bigger (shaft, bearings, gears etc).
I've went though several boxes and pumps on my LBZ. Currently running a blue top that seems to be developing some play in it. I've done the LML pump upgrade once and even it died after some years. Went with the PSC pump this last time about a year and a half ago and by far the best results.
PSC makes a heavy duty box. They're proud of them, but my buddy that put one on his LMM dually with oversized tires on it says it drives and turns better than stock.
We only use and install PSC boxes in these trucks. The PSC boxes seem to hold up the best in terms of tightness and the steering effort feels reduced compared to an OEM box.