Originally Posted by driveshaft-texas
Try to find an old guy a different alignment shop. Its tricky to get the shims right ...every change affects both caster and camber. All the new stuff uses eccentrics and youngsters don't understand the shim system. Last resort , Moog makes a problem-solver offset upper shaft to add some caster but you will have to remove both upper bushings to install
Unfortunately, Moog no longer makes an offset shaft with added caster. I had a set installed and we couldn't get any more caster than before. I then called Moog and they said that the offset shaft has adjustments only for camber. My alignment guy was equally surprised. He said he remembers Mood helper shafts that were obvious to the eye in the added caster. It must have been a phased out part.
Global West and a few others do make an offset shaft to add caster, but they all claim no more than another +1.25 degrees, and that's in the best of all possible worlds. That may not be enough to fix Joel's alignment, even with the right shop doing it.
To Joel: I know you just spent a chunk of change rebuilding your front end, but consider upgrading to upper and lower tubular arms from UMI. I just did that to my daily driver of more than a decade and while spendy, it was well worth every penny. We ended up settling on +6 degrees caster, and had room for +9. When I now drive 80 mph, it feels like what 60 mph was with the factory control arms, and I had +2.5 caster on one side, and +2.75 caster on the other. The stability and drivability is tremendous with the UMI arms. Highly, highly recommend them, especially if your frame has significant sag. It may be worth it to try another shop and see if they can get better specs, but even at optimum with the factory arms, it's nowhere near as good as with tubular arms made by the right company. UMI products are high quality with very reasonable prices.
And by the way, please, please, please do not buy cheapo tubular arms off of Ebay or even Summit that are made in China. They cost 1/3 of what US-made arms do, but are probably only 1/100 as safe. Read the fourth sticky in this forum: https://www.chevelles.com/forums/16-...ntrol-arm.html
The guy was very lucky that his Chinese control arm didn't fail on the highway at 70 mph. If it had, I doubt he would have survived to write that sticky.