Really?? 23-1/8"?? Well that's retarded. Factory is 22-5/8″ and you really shouldn't be needing MORE than 23". Originally, that 23" number that I came up with was to give you about +5° with a 3" lift and have since found that it's a better number to go with for a 4" lift. At 3", I typically find that a bit less is desirable to help keep the front drive shaft in check. Adding a lot of positive caster is nice but too much will give you drive line vibrations. If that really is the case, I would set it to the bare minimum and hope it's enough to prevent vibrations.
Ideally, if you place your angle finder on the front of the diff as is shown in my write-up, you should have a ZERO reading. If that's what you have, you have about +4° of caster and that is what you are wanting. If you are showing more, you most likely have too much due to your arms being too long.
