Is there an easy way to check the caster on the 80s?
Simply, there needs to be a flat spot on the housing to use as a reference point.
are the radius arm brackets a zero reference? What about the steering arm mounting area?
What about the pinion flange? It should be possible to say at 0 caster, the pinion angle is "x".
Does anyone know that?
I've got a set of arb bushings to install and would like to know where I start and where I end up.
Put an angle finding gauge across the bolts at the top of the knuckle.
This is the caster angle.
Rough sketch below. This might not be 100% accurateif there's variation in bolt heads, but will be close.
If you don't have one, you can use a digital angle finding ( inclinometer) app on your phone.