Concerned about my new Wilwood's

[quadfather]

Seems to me that if I place shims there the retainer will not have adequate tension on the bearing and it may have play. Grinding the spacers on the caliper mount sounds better to me, but this can't be right.
I'm installing a brand new moser 9" assembly. I should not have to be grinding spacers to make it work.

it sounds like you may have a problem with the axle standout . ford rears have 3 different housing ends . i assume you have the large brg. ends which use either a 2.5 standout for the late big ford ends or a 2.33.for the early big ford. the axle and brake manufacturers make there kits in both dimensions. it sounds like you have a mismatch. and no you cant shim the mount on the housing. this would allow the axles to float in and out. i hope this helps.