There is always 2 of those cast iron shims used from the factory. Often 1 will be stuck against the side of the axle tube so look closely in there. As mentioned, when you try to install the shim, it will need to be tapped into place. They crack very easily. Make sure it is lined up as straight as possible and use a plastic shot filled hammer to GENTLY tap it back into place. If if goes in smoothly with little effort, the housing has relaxed over the decades and the bearing preload will have been lost. It should install pretty tight. Then re-shimming from scratch with a service spacer and multiple shims will be required. Also make sure the case bearing caps have been kept in order, right and left and top and bottom for correct assembly. This is important because the case is honed from the factory similar to engine main bearing caps and mixing all that stuff up often results in trouble and broken parts. Good luck with it.
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