how good is the quality of those arms? is it hard to adjust or replace the ball joint in that setup? its interesting the ball joint can be moved around... is that style better than heim joint style like some other arm designs?
should i stick with OE GM lowers then? why are the lowers rarer in design and availability?
SPC is a very large suspension component manufacturing company, and SPC arms are very reliable/common on Tacoma's. I'm not particularly attached to the brand, but I will say they've been rock solid and haven't moved a mm over the last 15,000mi... and those haven't been easy miles. They're controlling a 35" tire now, offroad.
Ball joint is as easy to replace as it is to install on the arm in the first place (choose your orientation per the amount of caster you want/need, and tighten to the spec. Which I believe is around 120ft-lb). That orange goop is
Torque Tamper Detection/Torque Check goop, since I was unsure about it moving around on me... but have had zero movement. I try and put that on most of my suspension components so I can visually check if they've moved (doesn't help with bending or stretching though !).
I can't say if it's better or worse than a heim, but I can say that I have no UCA squeaks like I
always had with uniballs before.
If I got 89k out of the lowers... that would be good enough for me to replace them with the same. I consider doing the ZR2 swap for cast lower arms but... would need new axles, shocks, UCA, etc... and might as well swap in a ZR2 diff at that point for the e-locker. My recommendation is to go with OEM ones; they're fairly cheap.
15,000mi/3yrs, including a lot of this on my SPC arms: