Mark,
The way I understand it, both the hub and knuckle lose their dimensions over
time because of the force exerted on them(Ken Thoma referred to it as
"hammering" in our conversation at Marion). The original machining marks
may be there, but they may still be out of spec. The spec dimensions were
in a Cinnabar newsletter and are probably posted on the net somewhere.
IIRC, the hub minimum is 2.001 inches and is pretty easy to check - be sure
to check in several places along the length of the hub surface. I don't
remember the knuckle maximum, but you need a good inside micrometer to check
it. You can carry them to a good machine shop and they should check them
for you for a modest fee(cheaper than a good inside mic).
Patrick
> My coach has 32 k miles, and the original machining marks
> an the inside of the hubs. I don't know what the fit should be,
> but the fit should be GMC original.
The way I understand it, both the hub and knuckle lose their dimensions over
time because of the force exerted on them(Ken Thoma referred to it as
"hammering" in our conversation at Marion). The original machining marks
may be there, but they may still be out of spec. The spec dimensions were
in a Cinnabar newsletter and are probably posted on the net somewhere.
IIRC, the hub minimum is 2.001 inches and is pretty easy to check - be sure
to check in several places along the length of the hub surface. I don't
remember the knuckle maximum, but you need a good inside micrometer to check
it. You can carry them to a good machine shop and they should check them
for you for a modest fee(cheaper than a good inside mic).
Patrick
> My coach has 32 k miles, and the original machining marks
> an the inside of the hubs. I don't know what the fit should be,
> but the fit should be GMC original.
